Support Gradle builds

[fthomas]

It would be nice if Scala Steward could also extract/update dependencies from/in Gradle builds.

Note that @jvican had a preliminarily PR for Nebula/Gradle support in #2630.

[fthomas]

As I understand it, Gradle is a popular choice for Kotlin projects and that would allow Scala Steward to also keep those Kotlin projects up-to-date.

[fthomas]

gradle/gradle#21894 is interesting in this context and would allow Scala Steward to easily extract dependencies from Gradle builds.

[fthomas]

TIL that there is a BSP implementation for Gradle:

• https://github.com/microsoft/build-server-for-gradle
• https://devblogs.microsoft.com/java/new-build-server-for-gradle/
• https://devblogs.microsoft.com/java/announcing-the-build-server-for-gradle-open-source-repository/

With #2640 we could partially support Gradle builds via BSP.

[fthomas]

Another option to (partially) support Gradle builds is by extracting dependencies from Version Catalogs: #3534.