JvmName annotation support, single-file facade case (just rename file facade class)

- initial implementation of JvmFileClassesProvider
- migrate some of PackagePartClassUtil usages to JvmFileClassesProvider (mostly in Codegen)
- placeholder ("no resolve") implementation for migration period and unclear cases
- tests

compiler/testData/codegen/boxWithStdlib/platformNames/renamedFileClass.kt

@@ -0,0 +1,8 @@
+@file:jvmName("Util")
+package test
+
+fun foo(): String = bar()
+fun bar(): String = qux()
+fun qux(): String = "OK"
+
+fun box(): String = foo()