improvement: Change BSP ping message to empty buildtarget/compile

[jkciesluk]

workspace/buildTargets was causing unnecessary operations in bazelbsp. This new method should be faster and doesn't require any actions from the build server

[tgodzik]

Did you make sure it works with all the current build servers? sbt, 'mill' and bloop ?

[jkciesluk]

Did you make sure it works with all the current build servers? sbt, 'mill' and bloop ?

It works fine with sbt, mill and bazel but bloop reports an error "Empty build targets. Expected at least one build target identifier." Maybe its something we can change in bloop?

[tgodzik]

Did you make sure it works with all the current build servers? sbt, 'mill' and bloop ?

It works fine with sbt, mill and bazel but bloop reports an error "Empty build targets. Expected at least one build target identifier." Maybe its something we can change in bloop?

For now we could use the current ping for Bloop I think, later we would anyway want to check the version to use the correct ping. Using empty compile might be better in the long run.

[tgodzik]

LGTM!