MPP: Allow 'implements' relation only within the same Gradle project

Also allow COMMON modules on the "implementer" side

Original commit: 619e2bc0db

jps/jps-common/src/org/jetbrains/kotlin/config/KotlinFacetSettings.kt

@@ -216,6 +216,8 @@ class KotlinFacetSettings {
     var kind: KotlinModuleKind = KotlinModuleKind.DEFAULT
     var sourceSetNames: List<String> = emptyList()
     var isTestModule: Boolean = false
+
+    var externalProjectId: String = ""
 }
 
 interface KotlinFacetSettingsProvider {

jps/jps-common/src/org/jetbrains/kotlin/config/facetSerialization.kt

@@ -132,6 +132,7 @@ private fun readV2AndLaterConfig(element: Element): KotlinFacetSettings {
             } else null
         } ?: KotlinModuleKind.DEFAULT
         isTestModule = element.getAttributeValue("isTestModule")?.toBoolean() ?: false
+        externalProjectId = element.getAttributeValue("externalProjectId") ?: ""
         element.getChild("compilerSettings")?.let {
             compilerSettings = CompilerSettings()
             XmlSerializer.deserializeInto(compilerSettings!!, it)
@@ -292,6 +293,9 @@ private fun KotlinFacetSettings.writeLatestConfig(element: Element) {
         element.addContent(Element("newMppModelJpsModuleKind").apply { addContent(kind.name) })
         element.setAttribute("isTestModule", isTestModule.toString())
     }
+    if (externalProjectId.isNotEmpty()) {
+        element.setAttribute("externalProjectId", externalProjectId)
+    }
     productionOutputPath?.let {
         if (it != (compilerArguments as? K2JSCompilerArguments)?.outputFile) {
             element.addContent(Element("productionOutputPath").apply { addContent(PathUtil.toSystemIndependentName(it)) })