Support CockroachDB SQL Commands

[robins]

Support CockroachDB SQL Commands. Try to support these psql commands.

\d
\du
\dt
\d+
\dt+
\df - error
\dv
\l
\di
explain

[robins]

Cockroach db branch created towards this feature. Successfully recognises the engine and already supports \d despite some key functions missing.

More to come

[robins]

\du starts working

pg_auth_members not supported
Subquery (referencing parent table) not supported.

[robins]

\dt working

[robins]

\d+ and \dt+ working

pg_table_size() and pg_relation_size() not supported

[robins]

\dv working

[robins]

\l working

[robins]

\di working