Spike: Parse a project with Gradle build file

[fabapp2]

Try to parse a project that uses Gradle instead of Maven to learn about problems and answer questions like:

• Can Gradle and Maven be abstracted behind the same API? BuildFile
• How must the parser change, are two separate parsers required, how does a common API look like

It makes sense to look into Gradle support before implementing multi module projects only in Maven to learn about implications early on.

[fabapp2]

With OpenRewrite 7.26.0 the support for Gradle is not as complete as for Maven. Gradle files are parsed as Groovy G.CompilationUnits and the operations for Gradle, like adding plugins or getting dependencies, must be implemented as Recipes/Visitors for these Groovy files. To support the same API for Gradle as for Maven many Recipes/Visitors are missing and obviously the API would need to diverge or work on the lowest common denominator where possible, e.g. with scopes for dependencies.

Not now...