[ENH] Update remaining registry files

[MatthewMiddlehurst]

• remove current contents of registry
• base class lists and utilities have been moved to utils.base and reworked into a dictionary.
• all_estimators has been simplified a bit and moved to utils.discovery (same import as sklearn)
• adds check_tag_value to help validating the value of singular tags

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[TonyBagnall]

this all looks fine, but we could do with going over all base classes, make sure they have abstract constructors etc and resolve #2177