[MNT] Update and consolidate general estimator checks

[MatthewMiddlehurst]

Final part of AEP 05. As far as I know.

For the most part the all-estimator checks were mostly good, but could use some tidying. Some tests i merged to reduce fit calls and to reduce redundancy.

• check_fit_updates_state now also checks cloning, to avoid having to fit just to check clone resets is_fitted
• check_set_params had two tests essentially with a bit of redundancy, these have been merged
• check_constructor has the most confusing changes probably. It should mostly the same except all kw params are tested and all callable parameters are now allowed as defaults (matching sklearn)

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