[Gradle, MPP] Make kotlin tooling metadata task compatible w/ conf cache

The value should be memoized in task, so it can be serialized in a way to not use project in execution time
#KT-47612 In Progress

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/BuildKotlinToolingMetadataTest.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMetadataTarget
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTargetWithHostTests
 import org.jetbrains.kotlin.gradle.targets.js.KotlinJsTarget
 import org.jetbrains.kotlin.gradle.targets.jvm.KotlinJvmTarget
+import org.jetbrains.kotlin.gradle.tooling.BuildKotlinToolingMetadataTask
 import org.jetbrains.kotlin.gradle.tooling.buildKotlinToolingMetadataTask
 import org.jetbrains.kotlin.konan.target.KonanTarget
 import org.jetbrains.kotlin.library.KotlinAbiVersion
@@ -186,7 +187,7 @@ class BuildKotlinToolingMetadataTest {
     }
 
     private fun getKotlinToolingMetadata(): KotlinToolingMetadata {
-        val task = project.buildKotlinToolingMetadataTask!!.get()
-        return task.getKotlinToolingMetadata()
+        val task = project.buildKotlinToolingMetadataTask?.get() ?: error("No ${BuildKotlinToolingMetadataTask.defaultTaskName} task")
+        return task.kotlinToolingMetadata
     }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tooling/BuildKotlinToolingMetadataTask.kt

@@ -44,7 +44,7 @@ internal val Project.buildKotlinToolingMetadataTask: TaskProvider<BuildKotlinToo
         }
     }
 
-open class BuildKotlinToolingMetadataTask : DefaultTask() {
+abstract class BuildKotlinToolingMetadataTask : DefaultTask() {
 
     companion object {
         /**
@@ -59,19 +59,20 @@ open class BuildKotlinToolingMetadataTask : DefaultTask() {
     val outputFile: Property<File> = project.objects.property(File::class.java)
         .convention(project.buildDir.resolve("kotlinToolingMetadata").resolve("kotlin-tooling-metadata.json"))
 
-    @Internal
-    fun getKotlinToolingMetadata(): KotlinToolingMetadata {
-        return project.kotlinExtension.getKotlinToolingMetadata()
+    @get:Internal
+    internal val kotlinToolingMetadata by lazy {
+        project.kotlinExtension.getKotlinToolingMetadata()
     }
 
-    @Input
-    internal fun getKotlinToolingMetadataJson(): String = getKotlinToolingMetadata().toJsonString()
+    @get:Input
+    internal val kotlinToolingMetadataJson
+        get() = kotlinToolingMetadata.toJsonString()
 
     @TaskAction
     internal fun createToolingMetadataFile() {
         val outputFile = outputFile.orNull ?: return
         outputFile.parentFile.mkdirs()
-        outputFile.writeText(getKotlinToolingMetadataJson())
+        outputFile.writeText(kotlinToolingMetadataJson)
     }
 }