Add CLASS and ENUM location in java provider to match against class declarations and enums

[jmle]

Currently we have the TYPE location, which matches against all types (i.e. classes, interfaces, enum and annotation types). It would be ideal to be able to match exclusively against class declarations, for instance to be able to look for annotated classes and not other types.

Also, implement the ENUM location, which is currently unimplemented.

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[shawn-hurley]

Knowing what we know now about the types from the search engine, this may be possible but you may have to write a lot of code I think to get that. Just a heads up.

[jmle]

Knowing what we know now about the types from the search engine, this may be possible but you may have to write a lot of code I think to get that. Just a heads up.

@shawn-hurley theoretically there is a way to look for classes only, which is more specific than TYPE. I'm working on it to see how it goes

[jmle]

We need to add ENUM still