Extract dependencies from Gradle Version Catalogs

[fthomas]

This adds partial support for Gradle builds that use a version catalog (i.e. a gradle/libs.versions.toml file). Dependencies are extracted from the version catalog just by parsing the libs.versions.toml file. Since the version catalog only contains libraries and no resolvers, the default resolver is used for the Scope of these libraries.

The support is only partial, because

• a default resolver is assumed (as mentioned above)
• dependencies and plugins that are defined in other Gradle build files are ignored
• additional version catalogs are ignored
• a version catalog with a custom name is ignored

Closes: #3534

[codecov]

Codecov Report

Attention: Patch coverage is 98.52941% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.88%. Comparing base (757f9bb) to head (4b19b78).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...scalasteward/core/buildtool/gradle/GradleAlg.scala	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3542      +/-   ##
==========================================
+ Coverage   89.77%   89.88%   +0.10%     
==========================================
  Files         171      174       +3     
  Lines        4970     5022      +52     
  Branches      494      437      -57     
==========================================
+ Hits         4462     4514      +52     
  Misses        508      508              

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