fix(crystal): remove non-working code

It's not working because it uses #send method which doesn't exist in Crystal

See: https://crystal-lang.org/reference/1.18/crystal_for_rubyists/metaprogramming_help.html#differences-between-ruby-and-crystal

Author: n-rodriguez

modules/openapi-generator/src/main/resources/crystal/base_object.mustache

@@ -1,78 +1,3 @@
-    # Builds the object from hash
-    # @param [Hash] attributes Model attributes in the form of hash
-    # @return [Object] Returns the model itself
-    def self.build_from_hash(attributes)
-      new.build_from_hash(attributes)
-    end
-
-    # Builds the object from hash
-    # @param [Hash] attributes Model attributes in the form of hash
-    # @return [Object] Returns the model itself
-    def build_from_hash(attributes)
-      return nil unless attributes.is_a?(Hash)
-      {{#parent}}
-      super(attributes)
-      {{/parent}}
-      self.class.openapi_types.each_pair do |key, type|
-        if !attributes[self.class.attribute_map[key]]? && self.class.openapi_nullable.includes?(key)
-          self.send("#{key}=", nil)
-        elsif type =~ /\AArray<(.*)>/i
-          # check to ensure the input is an array given that the attribute
-          # is documented as an array but the input is not
-          if attributes[self.class.attribute_map[key]].is_a?(Array)
-            self.send("#{key}=", attributes[self.class.attribute_map[key]].map { |v| _deserialize($1, v) })
-          end
-        elsif !attributes[self.class.attribute_map[key]].nil?
-          self.send("#{key}=", _deserialize(type, attributes[self.class.attribute_map[key]]))
-        end
-      end
-
-      self
-    end
-
-    # Deserializes the data based on type
-    # @param string type Data type
-    # @param string value Value to be deserialized
-    # @return [Object] Deserialized data
-    def _deserialize(type, value)
-      case type.to_sym
-      when :Time
-        Time.parse(value)
-      when :Date
-        Date.parse(value)
-      when :String
-        value.to_s
-      when :Integer
-        value.to_i
-      when :Float
-        value.to_f
-      when :Boolean
-        if value.to_s =~ /\A(true|t|yes|y|1)\z/i
-          true
-        else
-          false
-        end
-      when :Object
-        # generic object (usually a Hash), return directly
-        value
-      when /\AArray<(?<inner_type>.+)>\z/
-        inner_type = Regexp.last_match[:inner_type]
-        value.map { |v| _deserialize(inner_type, v) }
-      when /\AHash<(?<k_type>.+?), (?<v_type>.+)>\z/
-        k_type = Regexp.last_match[:k_type]
-        v_type = Regexp.last_match[:v_type]
-        ({} of Symbol => String).tap do |hash|
-          value.each do |k, v|
-            hash[_deserialize(k_type, k)] = _deserialize(v_type, v)
-          end
-        end
-      else # model
-        # models (e.g. Pet) or oneOf
-        klass = {{moduleName}}.const_get(type)
-        klass.respond_to?(:openapi_one_of) ? klass.build(value) : klass.build_from_hash(value)
-      end
-    end
-
     # Returns the string representation of the object
     # @return [String] String presentation of the object
     def to_s