[Gradle][KPM] Implement FragmentGranularMetadataResolverFactory

The logic is intended to be reused in ide import related logic

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/FragmentGranularMetadataResolverFactory.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.plugin.mpp.pm20
+
+internal class FragmentGranularMetadataResolverFactory {
+    private val resolvers = mutableMapOf<KotlinGradleFragment, FragmentGranularMetadataResolver>()
+
+    fun getOrCreate(fragment: KotlinGradleFragment): FragmentGranularMetadataResolver = resolvers.getOrPut(fragment) {
+        FragmentGranularMetadataResolver(fragment, lazy {
+            fragment.refinesClosure.minus(fragment).map { refinesFragment ->
+                getOrCreate(refinesFragment)
+            }
+        })
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/fragmentsMetadataCompilation.kt

@@ -113,15 +113,10 @@ private fun configureMetadataCompilationsAndCreateRegistry(
     metadataCompilationRegistry: MetadataCompilationRegistry
 ) {
     val project = module.project
-    val metadataResolutionByFragment = mutableMapOf<KotlinGradleFragment, FragmentGranularMetadataResolver>()
+    val metadataResolverFactory = FragmentGranularMetadataResolverFactory()
     module.fragments.all { fragment ->
-        val transformation = FragmentGranularMetadataResolver(fragment, lazy {
-            fragment.refinesClosure.minus(fragment).map {
-                metadataResolutionByFragment.getValue(it)
-            }
-        })
-        metadataResolutionByFragment[fragment] = transformation
-        createExtractMetadataTask(project, fragment, transformation)
+        val metadataResolver = metadataResolverFactory.getOrCreate(fragment)
+        createExtractMetadataTask(project, fragment, metadataResolver)
     }
     val compileAllTask = project.registerTask<DefaultTask>(lowerCamelCaseName(module.moduleClassifier, "metadataClasses"))
     module.fragments.all { fragment ->
@@ -285,4 +280,4 @@ private fun disableMetadataCompilationIfNotYetSupported(
 }
 
 private fun transformFragmentMetadataTaskName(fragment: KotlinModuleFragment) =
-    lowerCamelCaseName("resolve", fragment.disambiguateName("Metadata"))
+    lowerCamelCaseName("resolve", fragment.disambiguateName("Metadata"))