table locality that places a replica on all nodes

In multi-region clusters, [global](https://www.cockroachlabs.com/docs/v23.1/table-localities#global-tables) tables place a replica in every region, but not necessarily on every node. Reads from such a table avoid inter-region round trips, but still might incur intra-region round trips.

To avoid _any_ round trips at all, we would need a locality that places a replica on _every_ node. A table with such a guarantee might allow some interesting optimizations in the physical planner or distsender, like always planning local execution or calling directly into kvserver.

Jira issue: CRDB-33678

Epic CRDB-10667