* objects: migrate remote status to objects.status
* data_cloud: use objects.status
* objects: migrate remote._process to objects.transfer
* data_cloud: use objects.transfer
* objects: handle memfs staging objects in transfer
* fetch/import: use unified transfer()
* update get_remote and transfer exception usage
* update tests
* objects.transfer: use src ODB verify rules after xfer
* odb: move index from remote into odb
* objects.transfer: skip src status check when possible
* update tests
* remove dvc.remote
* odb.index: migrate to diskcache
* objects: fix status/transfer optimization
* update index usage
* state: remove dead sqlite related code
* update cloud tests
* drop unnecessary remove in tests
* use abstract base class in odb index
* status: load trees from local cache instead of remote odb when possible
* handle status when dir cache is explicitly removed