feat: add optional framework field to the bsp

[kpodsiad]

Supersedes #6822

[kpodsiad]

Do you know why one check is failing? It doesn't seem related to my changes. I wanted to ask before I'll try to investigate it myself.

[adpi2]

I just re-started the CI to see if the failure re-appears.

[adpi2]

The failure is not related to your changes. It also happened in #6824 and #6820.

I pushed a fix here to see if it's better.

[adpi2]

It looks good. But could you adapt the test here:

sbt/server-test/src/test/scala/testpkg/BuildServerTest.scala

Lines 299 to 313 in ba5f752

	test("buildTarget/scalaTestClasses") { _ =>
	val buildTarget = buildTargetUri("runAndTest", "Test")
	val badBuildTarget = buildTargetUri("badBuildTarget", "Test")
	svr.sendJsonRpc(
	s"""{ "jsonrpc": "2.0", "id": "72", "method": "buildTarget/scalaTestClasses", "params": {
	| "targets": [{ "uri": "$buildTarget" }, { "uri": "$badBuildTarget" }]
	|} }""".stripMargin
	)
	assert(processing("buildTarget/scalaTestClasses"))
	assert(svr.waitForString(10.seconds) { s =>
	(s contains """"id":"72"""") &&
	(s contains """"tests.FailingTest"""") &&
	(s contains """"tests.PassingTest"""")
	})
	}

You should be able to run it with:

sbt serverTestProj/testOnly testpkg.BuildServerTest