KT-5524 Support [platformName] annotation for class members

@platformName is now supported for final non-overriding class member functions
(including property accessors).
Front-end provides diagnostics for inapplicable annotation cases.
Code generation updated:
- ignore kotlin.platform.platformName annotation for Java class methods;
- bridges generation generates proper JVM declarations in case of methods renamed with @platformName.
@platformName-related tests added.

#KT-5524 Fixed

compiler/testData/diagnostics/testsWithStdLib/duplicateJvmSignature/platformNames.txt

@@ -1,4 +1,16 @@
-package
+package 
 
+kotlin.platform.platformName(name = "barInt": kotlin.String) internal fun bar(/*0*/ x: kotlin.List<kotlin.Int>): kotlin.Unit
+kotlin.platform.platformName(name = "barStr": kotlin.String) internal fun bar(/*0*/ x: kotlin.List<kotlin.String>): kotlin.Unit
 kotlin.platform.platformName(name = "bar": kotlin.String) internal fun foo(/*0*/ a: kotlin.Any): kotlin.Unit
 internal fun kotlin.Any.foo(): kotlin.Unit
+
+internal final class C {
+    public constructor C()
+    internal final var rwProp: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    internal final fun getRwProp(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    internal final fun setRwProp(/*0*/ v: kotlin.Int): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}