Couchbase agent changelog

Arena batches are handed over in the order they were written instead of being re-sorted by transaction id, which on Oracle LogMiner inverted two changes sharing an SCN and wrote the older value to the target;

Booleans and maps keep their type through the arena cache, instead of reaching the target as "true"/"false" and as a non-JSON string;

A failing step of the reader stop no longer skips the rest of it, which left the loop running and turned every later stop into a no-op;

Added the source lag probe, reporting the unread change backlog and how far behind the last read transaction is;

ARRAY column values are no longer dropped, on snapshot, Eventing and DCP alike;

Eventing: A caught up entity no longer runs the full change query on every poll;

Added the Couchbase DCP source agent (couchbase-dcp): native DCP CDC without the Eventing service. Source-only. Community Edition and Enterprise Edition. See Change data capture (DCP);

Added support to Query Studio;

Improved retry mechanism for error handling around CHANNEL_CLOSED_WHILE_IN_FLIGHT and NO_MORE_RETRIES;

Improved support for enhaced columns discovery (precision, lenght, scale);

GSSD-891: Additional configurable timeout params for fine graned control on top of Couchbase SDK services;

Fixed a number data type mapping issue;

Agent compatibility upgrade to Gluesync 2.2;