Use '$' instead of '-' in package part class names

Otherwise some tools break (e.g. CheckMethodAdapter in ASM, used in generic
signature writer) because they expect class names to be Java identifiers.

Some tests fixed, some will be fixed in future commits

jps-plugin/testData/incremental/pureKotlin/topLevelMembersInTwoFiles/build.log

@@ -1,7 +1,7 @@
 Cleaning output files:
-out/production/module/test/TestPackage-a-*.class
+out/production/module/test/TestPackage$a$*.class
 out/production/module/test/TestPackage.class
 End of files
 Compiling files:
 src/a.kt
-End of files
+End of files