PostgreSQL, adapter automatically reloads it's type map. Closes #14678.

[Yves Senn & Matthew Draper]
PostgreSQL, warn once per connection per missing OID. Closes #14275.

[Yves Senn & Matthew Draper]
Merge pull request #14692 from senny/pg/reload_type_map_for_unknown_types

PostgreSQL automatic type map reload