feat: add support for mise.toml file

Author: gperdomor

__tests__/main.test.ts

@@ -114,6 +114,9 @@ describe('main tests', () => {
       ${'{"devEngines": {"runtime": [{"name": "bun"}, {"name": "node", "version": "22.0.0"}]}}'} | ${'22.0.0'}
       ${'[tools]\ngo="latest"\nnode = "24.10"'}                                                  | ${'24.10'}
       ${'[tools]\nnode = "22.12"'}                                                               | ${'22.12'}
+      ${'[tools]\ngo="latest"\nnode = "24.10"'}                                                  | ${'24.10'}
+      ${'[tools]\nnode = { version = "22.20" }'}                                                 | ${'22.20'}
+      ${'[tools]\nnode = { postinstall = "corepack enable" }'}                                   | ${null}
     `.it('parses "$contents"', ({contents, expected}) => {
       const existsSpy = jest.spyOn(fs, 'existsSync');
       existsSpy.mockImplementation(() => true);