[FEATURE REQUEST] Support postgres_privileges for columns

[OrangeDog]

Is your feature request related to a problem? Please describe.
Postgres supports column-level permissions. Salt does not.

GRANT { { SELECT | INSERT | UPDATE | REFERENCES } ( column_name [, ...] )
    [, ...] | ALL [ PRIVILEGES ] ( column_name [, ...] ) }
    ON [ TABLE ] table_name [, ...]
    TO role_specification [, ...] [ WITH GRANT OPTION ]

Describe the solution you'd like
For example, this

role:
  postgres_privileges.present:
    - object_name: tbl.col
    - object_type: column
    - privileges: [ INSERT, UPDATE ]

would generate

GRANT INSERT "col", UPDATE "col" ON "tbl" TO "role";

A way to do multiple columns at once would be nice, but they have to be in the same table.

Describe alternatives you've considered
Manually construct the GRANT command, but checking for whether it's necessary is difficult.
Otherwise only using tale-level privileges.

[sagetherage]

@OrangeDog has Postgres always supported this and not Salt or is this a new feature for Postgres? I was trying to find it, but I got lost. Wondering if I get eyes on it sooner if it is a recent addition (recent is definitely a relative term) and then get work done hopefully sooner.

[OrangeDog]

Looks like it was added in 8.4, so twelve years ago.
https://www.postgresql.org/docs/8.4/sql-grant.html

[sagetherage]

Oh, well, we really should get on that!