Generate gradle plugin stubs for JSON schema plugin

[andriy-dmytruk]

Switch JSON schema to generate Gradle configurations based on micronaut-build-plugin-sourcegen.

The generated plugin will:

• Have the same properties defined
• Have the javadoc copied as defined in this repo
• Add the generated files as build sources

This would simplify support, as additional properties would require no manual changes in the plugins. Some properties would already be added in this PR: micronaut-projects/micronaut-json-schema#163.

Current support

• Currently a tmp repo is used to verify that build passes and uses this json schema PR: Generate build plugin sources for JSON schema generator micronaut-json-schema#165.

• The dependency on micronaut-build-plugin-sourcegen is compile time only.

• The lang property is changed to language, as that is the property maven and common files use. The capitalization of inputUrl has also changed.

Maven	Gradle	Plugingen
inputURL	inputUrl	inputURL
inputFile	inputFile	inputFile
inputDirectory	inputDirectory	inputDirectory
language default=JAVA	lang default=JAVA	language default=JAVA
outputDirectory	outputDirectory	outputDirectory
outputPackageName default=io.micronaut.jsonschema	outputPackageName default=io.micronaut.jsonschema	outputPackageName default=io.micronaut.jsonschema
outputFileName	outputFileName	outputFileName
acceptedUrlPatterns	acceptedUrlPatterns	acceptedUrlPatterns
enabled default=false	enabed default=true	enabled default=false/true

@melix would appreciate your feedback

[sonarqubecloud]

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