this will allow for some nice runtime analysis down the road.
also, this allows for wrapping database handles in a way that
can interact with these contexts
requires https://review.dev.storj.io/c/storj/dbx/+/514
Change-Id: Ib087b7cd73296dd2c1e0331314da34d861f61d2b
this allows for setting $STORJ_METAINFO_POSTGRESQL_USE_ALT=yes if you
want to use the cockroachkv implementation for metainfo against postgres
Change-Id: I0c9458c83fd67ee63ef4a78351e64a80a0647408