Limit class name checks to bad characters

Restricting component class names to only contain
Character.isJavaIdentifierPart was too strict and causing too many
existing apps to fail install.

Bug: 294158017
Bug: 259946410
Test: atest AndroidPackageParsingValidationTest
Change-Id: Ic8c53d333249c08e4f982c68820836cb81f4a03a