Make enterprise features open source

[JelteF]

This PR makes all of the features open source that were previously only
available in Citus Enterprise.

Features that this adds:

1. Non blocking shard moves/shard rebalancer
   (citus.logical_replication_timeout)
2. Propagation of CREATE/DROP/ALTER ROLE statements
3. Propagation of GRANT statements
4. Propagation of CLUSTER statements
5. Propagation of ALTER DATABASE ... OWNER TO ...
6. Optimization for COPY when loading JSON to avoid double parsing of
   the JSON object (citus.skip_jsonb_validation_in_copy)
7. Support for row level security
8. Support for pg_dist_authinfo, which allows storing different
   authentication options for different users, e.g. you can store
   passwords or certificates here.
9. Support for pg_dist_poolinfo, which allows using connection poolers
   in between coordinator and workers
10. Tracking distributed query execution times using
    citus_stat_statements (citus.stat_statements_max,
    citus.stat_statements_purge_interval,
    citus.stat_statements_track). This is disabled by default.
11. Blocking tenant_isolation
12. Support for sslkey and sslcert in citus.node_conninfo

[onderkalaci]

Steps are documented on https://github.com/citusdata/citus-enterprise/pull/818 and review has been done there.

[maziar-dandc]

Wow nice! Will the enterprise version repository be retired and all development moved over to the main repo?

[marcocitus]

Wow nice! Will the enterprise version repository be retired and all development moved over to the main repo?

Pretty much. To be honest almost all development was already on this repo. We mainly merged this repo into the enterprise repo. We might still keep it around as a mirror for hot fixes.

[ghost]

Great works. thanks for your greate works.

[viggy28]

Just leaving my tweet from three days ago https://twitter.com/viggy28/status/1536157371465990144

This is amazing.

[viggy28]

What about citus MX feature https://docs.citusdata.com/en/v9.3/arch/mx.html ?

[hlakshmi]

Thanks a lot for this. Is there a plan to open source the Citus Warp tool which is used for migrating to Citus without downtime?

[marcocitus]

What about citus MX feature https://docs.citusdata.com/en/v9.3/arch/mx.html ?

It's fully integrated into Citus 11. You can run distributed queries from any node. (DDL still needs to go via the coordinator)