WIP: Bzlmod part the twenty-eighth

Added `scalacopts = ["-language:higherKinds"]` to the compiler_plugin
target to fix:

```txt
ERROR: rules_scala/test/src/main/scala/scalarules/test/compiler_plugin/BUILD.bazel:3:14:
  scala @@//test/src/main/scala/scalarules/test/compiler_plugin:compiler_plugin failed:
  (Exit 1): scalac failed: error executing Scalac command
  (from target //test/src/main/scala/scalarules/test/compiler_plugin:compiler_plugin)
  bazel-out/darwin_arm64-opt-exec-ST-d57f47055a04/bin/src/java/io/bazel/rulesscala/scalac/scalac
  ... (remaining 1 argument skipped)
test/src/main/scala/scalarules/test/compiler_plugin/KindProjected.scala:6:
error: not found: type *
class KKTImpl extends HKT[Either[String, *]]
                                         ^
test/src/main/scala/scalarules/test/compiler_plugin/KindProjected.scala:6:
error: Either[String,<error>] takes no type parameters, expected: 1
class KKTImpl extends HKT[Either[String, *]]
```

Author: mbland

test/src/main/scala/scalarules/test/compiler_plugin/BUILD.bazel

@@ -2,6 +2,7 @@ load("//scala:scala.bzl", "scala_library")
 
 scala_library(
     name = "compiler_plugin",
+    scalacopts = ["-language:higherKinds"],
     testonly = True,
     srcs = ["KindProjected.scala"],
     visibility = ["//visibility:public"],