feat(kotlin-spring): add kotlin-springboot-4 sample with Jackson 3

Author: yonatankarp

bin/configs/kotlin-spring-boot-4.yaml

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+generatorName: kotlin-spring
+outputDir: samples/server/petstore/kotlin-springboot-4
+library: spring-boot
+inputSpec: modules/openapi-generator/src/test/resources/3_0/petstore.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-spring
+additionalProperties:
+  documentationProvider: none
+  annotationLibrary: none
+  useSwaggerUI: "false"
+  serviceImplementation: "true"
+  serializableModel: "true"
+  beanValidations: "true"
+  useSpringBoot4: "true"
+  useJackson3: "true"
+  requestMappingMode: api_interface
+  gradleBuildFile: "true"

samples/server/petstore/kotlin-springboot-4/.openapi-generator-ignore

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+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/server/petstore/kotlin-springboot-4/.openapi-generator/FILES

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+.openapi-generator-ignore
+README.md
+build.gradle.kts
+gradle/wrapper/gradle-wrapper.jar
+gradle/wrapper/gradle-wrapper.properties
+gradlew
+gradlew.bat
+pom.xml
+settings.gradle
+src/main/kotlin/org/openapitools/Application.kt
+src/main/kotlin/org/openapitools/api/ApiUtil.kt
+src/main/kotlin/org/openapitools/api/Exceptions.kt
+src/main/kotlin/org/openapitools/api/PetApiController.kt
+src/main/kotlin/org/openapitools/api/PetApiService.kt
+src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt
+src/main/kotlin/org/openapitools/api/StoreApiController.kt
+src/main/kotlin/org/openapitools/api/StoreApiService.kt
+src/main/kotlin/org/openapitools/api/StoreApiServiceImpl.kt
+src/main/kotlin/org/openapitools/api/UserApiController.kt
+src/main/kotlin/org/openapitools/api/UserApiService.kt
+src/main/kotlin/org/openapitools/api/UserApiServiceImpl.kt
+src/main/kotlin/org/openapitools/model/Category.kt
+src/main/kotlin/org/openapitools/model/ModelApiResponse.kt
+src/main/kotlin/org/openapitools/model/Order.kt
+src/main/kotlin/org/openapitools/model/Pet.kt
+src/main/kotlin/org/openapitools/model/Tag.kt
+src/main/kotlin/org/openapitools/model/User.kt
+src/main/resources/application.yaml
+src/test/kotlin/org/openapitools/api/PetApiTest.kt
+src/test/kotlin/org/openapitools/api/StoreApiTest.kt
+src/test/kotlin/org/openapitools/api/UserApiTest.kt

samples/server/petstore/kotlin-springboot-4/.openapi-generator/VERSION

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+7.21.0-SNAPSHOT

samples/server/petstore/kotlin-springboot-4/README.md

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+# openAPIPetstore
+
+This Kotlin based [Spring Boot](https://spring.io/projects/spring-boot) application has been generated using the [OpenAPI Generator](https://github.com/OpenAPITools/openapi-generator).
+
+## Getting Started
+
+This document assumes you have either maven or gradle available, either via the wrapper or otherwise. This does not come with a gradle / maven wrapper checked in.
+
+By default a [`pom.xml`](pom.xml) file will be generated. If you specified `gradleBuildFile=true` when generating this project, a `build.gradle.kts` will also be generated. Note this uses [Gradle Kotlin DSL](https://github.com/gradle/kotlin-dsl).
+
+To build the project using maven, run:
+```bash
+mvn package && java -jar target/openapi-spring-1.0.0.jar
+```
+
+To build the project using gradle, run:
+```bash
+gradle build && java -jar build/libs/openapi-spring-1.0.0.jar
+```
+
+If all builds successfully, the server should run on [http://localhost:8080/](http://localhost:8080/)

samples/server/petstore/kotlin-springboot-4/build.gradle.kts

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+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+group = "org.openapitools"
+version = "1.0.0"
+java.sourceCompatibility = JavaVersion.VERSION_17
+
+repositories {
+    mavenCentral()
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = "17"
+}
+
+plugins {
+    val kotlinVersion = "2.2.0"
+    id("org.jetbrains.kotlin.jvm") version kotlinVersion
+    id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
+    id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
+    id("org.springframework.boot") version "4.0.1"
+    id("io.spring.dependency-management") version "1.1.7"
+}
+
+dependencies {
+    implementation("org.jetbrains.kotlin:kotlin-stdlib")
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+        implementation("org.springframework.boot:spring-boot-starter-webmvc")
+
+    implementation("com.google.code.findbugs:jsr305:3.0.2")
+    implementation("tools.jackson.dataformat:jackson-dataformat-yaml")
+    implementation("tools.jackson.dataformat:jackson-dataformat-xml")
+    implementation("tools.jackson.module:jackson-module-kotlin")
+    implementation("org.springframework.data:spring-data-commons")
+    implementation("jakarta.validation:jakarta.validation-api")
+    implementation("jakarta.annotation:jakarta.annotation-api:3.0.0")
+
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
+    testImplementation("org.springframework.boot:spring-boot-starter-test") {
+        exclude(module = "junit")
+    }
+}

samples/server/petstore/kotlin-springboot-4/gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists