[lombok] Refactoring, cleaning, better tests

Add assertions to tests
Add lombok license
Provide String.[de]capitalize() implementation
Get rid of weak map because it seems it is useless here

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/extensions/SyntheticJavaResolveExtension.kt

@@ -17,7 +17,7 @@ interface SyntheticJavaResolveExtension {
     ) {
         fun getProvider(project: Project): SyntheticJavaPartsProvider {
             val instances = getInstances(project)
-            val providers = instances.map { it.getProvider() }
+            val providers = instances.map { it.buildProvider() }
             return if (providers.isEmpty()) {
                 SyntheticJavaPartsProvider.EMPTY
             } else {
@@ -26,7 +26,7 @@ interface SyntheticJavaResolveExtension {
         }
     }
 
-    fun getProvider(): SyntheticJavaPartsProvider
+    fun buildProvider(): SyntheticJavaPartsProvider
 
 }