[repository] Drop the entities.extid column and associated cache This was not necessary anymore with promoted usage of the new data import API. Turn repository's _type_extid_cache to _type_cache with only the entity's type as key. This introduces an backward incompatible change: entity_metas dict doesn't contains anymore the extid key, but it doesn't seem used at all anywhere, so this sounds acceptable. Closes #15538317

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.. _appobject_module:

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:mod:`cubicweb.appobject`

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.. automodule:: cubicweb.appobject

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   .. autoclass:: AppObject

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      :show-inheritance:

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      :members: