couch: add identity view to get all keys

This needs to be included in the platforms views.

assigned to @azul

mentioned in commit platform@842b7d14

mentioned in merge request platform!145 (merged)

deleted source branch feature/different-keytypes

restored source branch feature/different-keytypes

added 1 commit

• 9e6c3639 - keys: store type and rev in hash rather than serialized

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added 1 commit

• a55cc365 - keys: store type and rev in hash rather than serialized

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merged

mentioned in commit b58c2d84