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

Author: mbland

third_party/utils/src/test/BUILD

@@ -13,6 +13,9 @@ scala_library(
         any_3 = [
             "io/bazel/rulesscala/utils/Scala3CompilerUtils.scala",
         ],
+        between_2_13_9_and_3 = [
+            "scala/tools/cmd/Scala_2_13_9_CommandLineParser.scala",
+        ],
     ),
     visibility = ["//visibility:public"],
     deps = [

third_party/utils/src/test/scala/tools/cmd/Scala_2_13_9_CommandLineParser.scala

@@ -0,0 +1,8 @@
+package scala.tools.cmd;
+
+// Hack due to CommandLineParser disappearing in Scala 2.13.9:
+// https://github.com/scala/scala/pull/10057
+object CommandLineParser {
+    def tokenize(line: String): List[String] = scala.sys.process.Parser
+        .tokenize(line)
+}