Add InteliiJ aspect info (#242)

- supplies the language version in the kt provider
- allows the bazel-intellij aspect processing to correctly identify the version
  of Kotlin being used and update the source accordingly
- part of the fix for bazelbuild/intellij#1274

kotlin/internal/defs.bzl

@@ -23,6 +23,7 @@ KtJvmInfo = provider(
         "module_name": "the module name",
         "srcs": "the source files. [intelij-aspect]",
         "outputs": "output jars produced by this rule. [intelij-aspect]",
+        "language_version": "version of kotlin used. [intellij-aspect]",
     },
 )
 

kotlin/internal/jvm/compile.bzl

@@ -250,6 +250,7 @@ def kt_jvm_compile_action(ctx, rule_kind, output_jar):
         kt = _KtJvmInfo(
             srcs = ctx.files.srcs,
             module_name = module_name,
+            language_version = toolchain.api_version,
             # intelij aspect needs this.
             outputs = struct(
                 jdeps = ctx.outputs.jdeps,