[REQ] [MVN] Support for generateMetadata option for maven plugin

Is your feature request related to a problem? Please describe.

Faced .openapi-genarator/FILES and .openapi-generator/VERSION files when generate in openapi-yaml language with maven-plugin.

In order to skip above files generation, generateMetadata option is available in DefaultGenerator class (https://github.com/OpenAPITools/openapi-generator/blob/8a426b2f4a591246a6e3d85e17338ead0cd83c48/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultGenerator.java#L93). However, there is no option in related maven plugin CodegenMojo. Therefore, .openapi-genarator/FILES and .openapi-generator/VERSION files could not be skipped when generating in any language -except setting generateSupportingFiles to false-.

Describe the solution you'd like

By adding generateMetadata option to maven plugin CodegenMojo, we can easily skip the generation of FILES and VERSION files.

Start in the Maven plugin's CodegenMojo and compare its options with the generateMetadata setting in DefaultGenerator.java. Trace how plugin options reach generation, then verify through the Maven plugin generation flow that metadata files can be skipped without disabling other supporting files.