[13.x] Add enum types to repository contract / allow enums for tagged caches

[jackbayliss]

12.x hasadded enum support for all the repository methods. For 13.x I thought it's good practice to keep the contract updated.

Then, I noticed there's tag caches, that probably should allow enums too.. as some methods don't fallback to the Repository (they override them).

So this PR:

• Adds enum types to the Repository contract
• Ensures TaggedCache / RedisTaggedCache also allow enums for any methods they override.

This means:

• The contract is up to date
• Tags work with enums too.

// This now allows enums too...
Cache::tags(['people', 'authors'])->put(Test::FOO);
Cache::tags(['people', 'authors'])->get(Test::FOO);

I added tests for the TaggedCache, can't see anything for the Redis one.

Targeted 13.x as interface changes..

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[jackbayliss]

Static analysis is failing cause master needs to be caught up - but good for review, thanks!