pantsbuild / pants / 28411659577

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Add support for source jars to BSP protocol (#23410)

This PR is essentially a continuation of #21143, adding source JAR
support for the JVM BSP plugin. It adds centralized source jar
resolution to Coursier, allowing it to resolve `-source.jar`s when
downloading dependencies, both for Java and Scala, thus enabling code
navigation for third party dependencies in VS Code, IntelliJ, and other
editors with support.

I've been dogfooding this on our mid-sized Scala monorepo, and with
this, the developer experience moves from unbearable to excellent.

Disclosure: Claude code has helped me with some of the fixes, but all
code has been reviewed manually (to the extent that I know the jvm
backends).

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