[BTA] Add Kotlin version getter into CompilationService

^KT-62921 In Progress

compiler/build-tools/kotlin-build-tools-api/api/kotlin-build-tools-api.api

@@ -12,6 +12,7 @@ public abstract interface class org/jetbrains/kotlin/buildtools/api/CompilationS
 	public abstract fun calculateClasspathSnapshot (Ljava/io/File;Lorg/jetbrains/kotlin/buildtools/api/jvm/ClassSnapshotGranularity;)Lorg/jetbrains/kotlin/buildtools/api/jvm/ClasspathEntrySnapshot;
 	public abstract fun compileJvm (Lorg/jetbrains/kotlin/buildtools/api/ProjectId;Lorg/jetbrains/kotlin/buildtools/api/CompilerExecutionStrategyConfiguration;Lorg/jetbrains/kotlin/buildtools/api/jvm/JvmCompilationConfiguration;Ljava/util/List;Ljava/util/List;)Lorg/jetbrains/kotlin/buildtools/api/CompilationResult;
 	public abstract fun finishProjectCompilation (Lorg/jetbrains/kotlin/buildtools/api/ProjectId;)V
+	public abstract fun getCompilerVersion ()Ljava/lang/String;
 	public abstract fun getCustomKotlinScriptFilenameExtensions (Ljava/util/List;)Ljava/util/Collection;
 	public static fun loadImplementation (Ljava/lang/ClassLoader;)Lorg/jetbrains/kotlin/buildtools/api/CompilationService;
 	public abstract fun makeCompilerExecutionStrategyConfiguration ()Lorg/jetbrains/kotlin/buildtools/api/CompilerExecutionStrategyConfiguration;

compiler/build-tools/kotlin-build-tools-api/src/main/kotlin/org/jetbrains/kotlin/buildtools/api/CompilationService.kt

@@ -9,7 +9,6 @@ import org.jetbrains.kotlin.buildtools.api.jvm.ClassSnapshotGranularity
 import org.jetbrains.kotlin.buildtools.api.jvm.ClasspathEntrySnapshot
 import org.jetbrains.kotlin.buildtools.api.jvm.JvmCompilationConfiguration
 import java.io.File
-import java.util.*
 
 /**
  * A facade for invoking compilation and related stuff (such as [calculateClasspathSnapshot]) in Kotlin compiler.
@@ -78,6 +77,13 @@ public interface CompilationService {
      */
     public fun getCustomKotlinScriptFilenameExtensions(classpath: List<File>): Collection<String>
 
+    /**
+     * Returns the version of the Kotlin compiler used to run compilation.
+     *
+     * @return A string representing the version of the Kotlin compiler, for example `2.0.0-Beta4`.
+     */
+    public fun getCompilerVersion(): String
+
     @ExperimentalBuildToolsApi
     public companion object {
         @JvmStatic

compiler/build-tools/kotlin-build-tools-impl/src/main/kotlin/org/jetbrains/kotlin/buildtools/internal/CompilationServiceImpl.kt

@@ -24,6 +24,7 @@ import org.jetbrains.kotlin.cli.jvm.K2JVMCompiler
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem
 import org.jetbrains.kotlin.compilerRunner.KotlinCompilerRunnerUtils
+import org.jetbrains.kotlin.config.KotlinCompilerVersion
 import org.jetbrains.kotlin.config.Services
 import org.jetbrains.kotlin.daemon.client.BasicCompilerServicesWithResultsFacadeServer
 import org.jetbrains.kotlin.daemon.common.CompilerId
@@ -230,6 +231,8 @@ internal object CompilationServiceImpl : CompilationService {
             ExitCode.COMPILATION_ERROR
         }).asCompilationResult
     }
+
+    override fun getCompilerVersion(): String = KotlinCompilerVersion.VERSION
 }
 
 internal class CompilationServiceProxy : CompilationService by CompilationServiceImpl