[2.x] Remote caching support

[eed3si9n]

This implements Bazel-compat remote caching support via a plugin. See https://eed3si9n.com/sbt-remote-cache-with-bazel-compat/ for details.

[eed3si9n]

Most test failures seem to have the stacktrace of

[info] [error] java.lang.IllegalArgumentException: No companions was stored!
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufDefaults$EmptyLazyCompanions$.get(ProtobufDefaults.scala:87)
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufDefaults$EmptyLazyCompanions$.get(ProtobufDefaults.scala:86)
[info] [error] 	at xsbti.api.AnalyzedClass.api(AnalyzedClass.java:76)
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufWriters.toAnalyzedClass(ProtobufWriters.scala:625)
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufWriters.$anonfun$8(ProtobufWriters.scala:726)
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufWriters.toApis$$anonfun$2(ProtobufWriters.scala:729)
[info] [error] 	at scala.collection.immutable.Map$Map1.foreach(Map.scala:258)
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufWriters.toApis(ProtobufWriters.scala:729)
[info] [error] 	at sbt.internal.inc.binary.converters.ProtobufWriters.toApisFile(ProtobufWriters.scala:740)
[info] [error] 	at sbt.internal.inc.binary.BinaryAnalysisFormat.writeAPIs(BinaryAnalysisFormat.scala:39)
[info] [error] 	at sbt.internal.inc.FileAnalysisStore$BinaryFileStore.set$$anonfun$1(FileAnalysisStore.scala:97)
[info] [error] 	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[info] [error] 	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[info] [error] 	at sbt.io.Using.apply(Using.scala:28)

Potentially some incompatibility due to protobuf?

[adpi2]

Potentially some incompatibility due to protobuf?

I got the same issue while working on #7522, and fixed it in 1c03463 by using a MixedAnalyzingCompiler.staticCachedStore instead of a FileAnalysisStore.binary. But then I removed that part of the code completely in 85fcb01.

[eed3si9n]

Potentially some incompatibility due to protobuf?

I got the same issue while working on #7522

In sbt/zinc#1347 I originally tried to backport "Bump protobuf-java 3.25.3" to Zinc 1.x and realized some tests failed, so probably the incompatibility between protobuf-java 3.25.3 (and ScalaPB?) is the issue, which I did upgrade in the Zinc 2.x branch.

[adpi2]

Hey I rebased the changes to fix the conflicts and I force pushed. @eed3si9n You'll need to pull again if you want to change anything.

[adpi2]

Looks quite good overall!