[NEOS-1626] Stop joining schema and table by dots (.)

[nickzelei]

This is problematic for any schema or table that has this character in it.

We kind of do this everywhere and should pick a different identifier to join them.

Separately, once we join them, we probably shouldn't separate them again unless we are sufficiently sure that the key is not capable of being a part of a schema or table (is this even possible to handle?)

_{From SyncLinear.com | NEOS-1626}