Code generator record and enum updates.

[mbien]

Implement basic record code generation features.

records:

• javac generates final methods for records unless they are already in the code
  • code can't override them which complicates things, but it can replace them using the abstract method impl generator
• made equals, hashCode and toString generators record aware
• disabled getter/setter and property generator for records (record accessors are regular method overrrides)

enums:

• toString generator supports now enums

fixes #7167

[mbien]

i went back and forth with implementing record accessors as getter generator or implements / override generator.

Ended up implementing it as override generator, since:

• JEP 395 uses the term component accessors, getters are elements of the bean pattern and records are no beans
• they are already there, so override makes most sense semantically (technically it is replacing the impl since javac won't generate the (final) synthetic method if it already exists)

I still don't like that the templates for simple tasks like those here are user customizable since there is nothing to customize other than having to remove a link.

[matthiasblaesing]

Looks good to me. Thank you!

[lahodaj]

Will take a look later today, thanks for working on this!

[mbien]

found a small issue where the equals/hashcode generator doesn't check if the methods are already there in the record, will fix it in a moment.

diff: https://github.com/apache/netbeans/compare/09e12a32b98f0d9d26dc9e80249c24211a613948..fa3bc2a302fe103295b7d5d94b10ced1162114f3
and: https://github.com/apache/netbeans/compare/fa3bc2a302fe103295b7d5d94b10ced1162114f3..8a4bbd44b1064b3f6108592acd135044a9ed6a72

[lahodaj]

Makes sense to me, thanks!