Convert CompilerAPICompat trait to adapter object

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

Author: mbland

third_party/utils/src/test/BUILD

@@ -14,10 +14,10 @@ scala_library(
             "io/bazel/rulesscala/utils/Scala3CompilerUtils.scala",
         ],
         before_2_13_9 = [
-            "io/bazel/rulesscala/utils/CompilerAPICompat_before_2_13_9.scala",
+            "io/bazel/rulesscala/utils/CommandLineParserAdapter_before_2_13_9.scala",
         ],
         between_2_13_9_and_3 = [
-            "io/bazel/rulesscala/utils/CompilerAPICompat_since_2_13_9.scala",
+            "io/bazel/rulesscala/utils/CommandLineParserAdapter_since_2_13_9.scala",
         ],
     ),
     visibility = ["//visibility:public"],

third_party/utils/src/test/io/bazel/rulesscala/utils/CompilerAPICompat_before_2_13_9.scala renamed to third_party/utils/src/test/io/bazel/rulesscala/utils/CommandLineParserAdapter_before_2_13_9.scala

@@ -2,6 +2,6 @@ package io.bazel.rulesscala.utils
 
 import scala.tools.cmd.CommandLineParser
 
-trait CompilerAPICompat {
+object CommandLineParserAdapter {
   def tokenize(cmd: String): List[String] = CommandLineParser.tokenize(cmd)
 }

third_party/utils/src/test/io/bazel/rulesscala/utils/CompilerAPICompat_since_2_13_9.scala renamed to third_party/utils/src/test/io/bazel/rulesscala/utils/CommandLineParserAdapter_since_2_13_9.scala

@@ -8,7 +8,8 @@ package scala {
 }
 
 package io.bazel.rulesscala.utils {
-  trait CompilerAPICompat {
-    def tokenize(cmd: String): List[String] = scala.rulesscala.Proxy.tokenize(cmd)
+  object CommandLineParserAdapter {
+    def tokenize(cmd: String): List[String] =
+      scala.rulesscala.Proxy.tokenize(cmd)
   }
 }

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

@@ -13,7 +13,7 @@ import scala.tools.nsc.Settings
 import scala.tools.nsc.reporters.StoreReporter
 import io.bazel.rulesscala.dependencyanalyzer.DependencyTrackingMethod
 
-object TestUtil extends CompilerAPICompat {
+object TestUtil {
   final val defaultTarget = "//..."
 
   val isWindows: Boolean = System.getProperty("os.name").toLowerCase.contains("windows")
@@ -115,7 +115,7 @@ object TestUtil extends CompilerAPICompat {
     output: AbstractFile
   ): List[StoreReporter#Info] = {
     // TODO: Optimize and cache global.
-    val options = tokenize(compileOptions)
+    val options = CommandLineParserAdapter.tokenize(compileOptions)
     val reporter = new StoreReporter()
     val settings = new Settings(println)
     val _ = new CompilerCommand(options, settings)