Add CommandLineParserAdapter for >=2.13.9 (#1634)

* Add scala.tools.cmd.CommandLineParser for >=2.13.9

Fixes //third_party/utils/src/test:test_util for Scala 2.13.9 and later
by providing a thin `scala.tools.cmd.CommandLineParser` adapter.

Before this change, building under Scala 2.13.14 produced:

```txt
$ bazel build --repo_env=SCALA_VERSION=2.13.14 \
    //third_party/utils/src/test:test_util

ERROR: .../third_party/utils/src/test/BUILD:6:14:
  scala @@//third_party/utils/src/test:test_util failed: (Exit 1):
  scalac failed: error executing Scalac command
  (from target //third_party/utils/src/test:test_util)
  bazel-out/darwin_arm64-opt-exec-ST-d57f47055a04/bin/src/java/io/bazel/rulesscala/scalac/scalac
  @bazel-out/darwin_arm64-fastbuild/bin/third_party/utils/src/test/test_util.jar-0.params

third_party/utils/src/test/io/bazel/rulesscala/utils/TestUtil.scala:10:
  error: object cmd is not a member of package tools
    import scala.tools.cmd.CommandLineParser
                       ^
third_party/utils/src/test/io/bazel/rulesscala/utils/TestUtil.scala:119:
  error: not found: value CommandLineParser
    val options = CommandLineParser.tokenize(compileOptions)
                  ^
```

Turns out `CommandLineParser` disappered in Scala 2.13.9, and its
`Parser` replacement is private:

- scala/scala#10057

* Use local proxy instead of scala.tools.cmd patch

Copied the `CompilerAPICompat` code verbatim from @WojciechMazur's
suggestion on #1634. Definitely seems more robust than injecting
`CommandLineParser` directly into `scala.tools.cmd`.

* Convert CompilerAPICompat trait to adapter object

Requested by @simuons in #1634. Renamed it as well to reflect its very
specific function.

Author: mbland

third_party/utils/src/test/BUILD

@@ -13,6 +13,12 @@ scala_library(
         any_3 = [
             "io/bazel/rulesscala/utils/Scala3CompilerUtils.scala",
         ],
+        before_2_13_9 = [
+            "io/bazel/rulesscala/utils/CommandLineParserAdapter_before_2_13_9.scala",
+        ],
+        between_2_13_9_and_3 = [
+            "io/bazel/rulesscala/utils/CommandLineParserAdapter_since_2_13_9.scala",
+        ],
     ),
     visibility = ["//visibility:public"],
     deps = [

third_party/utils/src/test/io/bazel/rulesscala/utils/CommandLineParserAdapter_before_2_13_9.scala

@@ -0,0 +1,7 @@
+package io.bazel.rulesscala.utils
+
+import scala.tools.cmd.CommandLineParser
+
+object CommandLineParserAdapter {
+  def tokenize(cmd: String): List[String] = CommandLineParser.tokenize(cmd)
+}

third_party/utils/src/test/io/bazel/rulesscala/utils/CommandLineParserAdapter_since_2_13_9.scala

@@ -0,0 +1,15 @@
+package scala {
+  package rulesscala {
+    // proxy to private[scala] compiler API
+    object Proxy {
+      def tokenize(cmd: String): List[String] = sys.process.Parser.tokenize(cmd)
+    }
+  }
+}
+
+package io.bazel.rulesscala.utils {
+  object CommandLineParserAdapter {
+    def tokenize(cmd: String): List[String] =
+      scala.rulesscala.Proxy.tokenize(cmd)
+  }
+}

third_party/utils/src/test/io/bazel/rulesscala/utils/TestUtil.scala

@@ -7,7 +7,6 @@ import scala.reflect.io.AbstractFile
 import scala.reflect.io.Directory
 import scala.reflect.io.PlainDirectory
 import scala.reflect.io.VirtualDirectory
-import scala.tools.cmd.CommandLineParser
 import scala.tools.nsc.CompilerCommand
 import scala.tools.nsc.Global
 import scala.tools.nsc.Settings
@@ -116,7 +115,7 @@ object TestUtil {
     output: AbstractFile
   ): List[StoreReporter#Info] = {
     // TODO: Optimize and cache global.
-    val options = CommandLineParser.tokenize(compileOptions)
+    val options = CommandLineParserAdapter.tokenize(compileOptions)
     val reporter = new StoreReporter()
     val settings = new Settings(println)
     val _ = new CompilerCommand(options, settings)