[java] typeIdentifier in grammar is incorrect.

[kaby76]

The JLS says explicitly:

TypeIdentifier:
    Identifier but not permits, record, sealed, var, or yield

But, in java/java/JavaParser.g4, it incorrectly adds several of those keywords that should not be there (#2923; partially fixed with #2925). This could result in ambiguity.

In addition, typeIdentifier was introduced and used in only one rule (in classOrInterfaceType). Presumably, this was done to avoid ambiguity with uses in other places, with identifier. This should be investigated.