fix: cache XmlRegistry instances

subprojects/xml-utils/src/main/java/com/itsaky/androidide/xml/resources/ResourceTableRegistry.kt

@@ -43,10 +43,12 @@ interface ResourceTableRegistry : XmlRegistry<ResourceTable> {
     @JvmStatic
     val COMPLETION_MANIFEST_ATTR_RES = Lookup.Key<ResourceTable>()
 
+    private var sInstance: ResourceTableRegistry? = null
+
     @JvmStatic
     fun getInstance(): ResourceTableRegistry {
       val klass = ResourceTableRegistry::class.java
-      return ServiceLoader.load(klass, klass.classLoader).findFirstOrThrow()
+      return sInstance ?: ServiceLoader.load(klass, klass.classLoader).findFirstOrThrow().also { sInstance = it }
     }
   }
 

subprojects/xml-utils/src/main/java/com/itsaky/androidide/xml/versions/ApiVersionsRegistry.kt

@@ -30,12 +30,17 @@ import com.itsaky.androidide.xml.registry.XmlRegistry
  * @author Akash Yadav
  */
 interface ApiVersionsRegistry : XmlRegistry<ApiVersions> {
+
   companion object {
 
+    private var sInstance: ApiVersionsRegistry? = null
+
     /** Get the default instance of [ApiVersionsRegistry]. */
-    @JvmStatic fun getInstance(): ApiVersionsRegistry {
+    @JvmStatic
+    fun getInstance(): ApiVersionsRegistry {
       val klass = ApiVersionsRegistry::class.java
-      return ServiceLoader.load(klass, klass.classLoader).findFirstOrThrow()
+      return sInstance ?: ServiceLoader.load(klass, klass.classLoader).findFirstOrThrow()
+        .also { sInstance = it }
     }
   }
 }

subprojects/xml-utils/src/main/java/com/itsaky/androidide/xml/widgets/WidgetTableRegistry.kt

@@ -30,11 +30,14 @@ interface WidgetTableRegistry : XmlRegistry<WidgetTable> {
 
   companion object {
 
+    private var sInstance: WidgetTableRegistry? = null
+
     /** Get the default instance of [WidgetTableRegistry]. */
     @JvmStatic
     fun getInstance(): WidgetTableRegistry {
       val klass = WidgetTableRegistry::class.java
-      return ServiceLoader.load(klass, klass.classLoader).findFirstOrThrow()
+      return sInstance ?: ServiceLoader.load(klass, klass.classLoader).findFirstOrThrow()
+        .also { sInstance = it }
     }
   }
 }