[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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# Check the CW versions and add the entity only if needed ?

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add_entity_type('CWSession')

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rql('DELETE CWProperty X WHERE X pkey "system.version.pyramid"',

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    ask_confirm=False)

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sql('DROP TABLE moved_entities')

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sql('ALTER TABLE entities DROP COLUMN asource')

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sql('ALTER TABLE entities DROP COLUMN extid')