🎉 Source MSSQL: implementation for CDC (#4689)

* first few classes for mssql cdc

* wip

* mssql cdc working against unit tests

* increment version

* add cdc acceptance test

* tweaks

* add file

* working on comprehensive tests

* change isolation from snapshot to read_committed_snapshot

* finalised type tests

* Revert "change isolation from snapshot to read_committed_snapshot"

This reverts commit 20c6768071.

* small docstring fix

* remove unused imports

* stress test fixes

* minor formatting improvements

* mssql cdc docs

* finish off cdc docs

* format fix

* update connector version

* add to changelog

* fix for sql server agent offline failing cdc enable on tables

* final structure

* few more updates

* undo unwanted changes

* add abstract test + more refinement

* remove CDC metadata to debezium

* use new cdc abstraction for mysql

* undo wanted change

* use cdc abstraction for postgres

* add files

* pull in latest changes

* ready

* rename class + add missing property

* use renamed class + move constants to MySqlSource

* use renamed class + move constants to PostgresSource

* move debezium to bases + upgrade debezium version + review comments

* downgrade version + minor fixes

* bring in latest changes from cdc abstraction

* reset to minutes

* bring in the latest changes

* format

* fix build

* address review comments

* bring in latest changes

* bring in latest changes

* use common abstraction for CDC via debezium for sql server

* remove debezium from build

* finalise PR

* should return Optional

* pull in latest changes

* pull in latest changes

* address review comments

* use common abstraction for CDC via debezium for mysql (#4604)

* use new cdc abstraction for mysql

* undo wanted change

* pull in latest changes

* use renamed class + move constants to MySqlSource

* bring in latest changes from cdc abstraction

* format

* bring in latest changes

* pull in latest changes

* use common abstraction for CDC via debezium for postgres (#4607)

* use cdc abstraction for postgres

* add files

* ready

* use renamed class + move constants to PostgresSource

* bring in the latest changes

* bring in latest changes

* pull in latest changes

* lower version for tests to run on CI

* format

* Update docs/integrations/sources/mssql.md

Co-authored-by: Sherif A. Nada <snadalive@gmail.com>

* addressing review comments

* fix for testGetTargetPosition

* format changes

Co-authored-by: George Claireaux <george@claireaux.co.uk>
Co-authored-by: Sherif A. Nada <snadalive@gmail.com>

docs/understanding-airbyte/cdc.md

@@ -14,7 +14,7 @@ The Airbyte Protocol outputs records from sources. Records from `UPDATE` stateme
 
 We add some metadata columns for CDC sources:
 
-* `ab_cdc_lsn` (specific to postgres source) is the point in the log where the record was retrieved
+* `ab_cdc_lsn` (postgres and sql server sources) is the point in the log where the record was retrieved
 * `ab_cdc_log_file` & `ab_cdc_log_pos` (specific to mysql source) is the file name and position in the file where the record was retrieved
 * `ab_cdc_updated_at` is the timestamp for the database transaction that resulted in this record change and is present for records from `DELETE`/`INSERT`/`UPDATE` statements 
 * `ab_cdc_deleted_at` is the timestamp for the database transaction that resulted in this record change and is only present for records from `DELETE` statements
@@ -32,10 +32,10 @@ We add some metadata columns for CDC sources:
 
 * [Postgres](../integrations/sources/postgres.md) (For a quick video overview of CDC on Postgres, click [here](https://www.youtube.com/watch?v=NMODvLgZvuE&ab_channel=Airbyte))
 * [MySQL](../integrations/sources/mysql.md)
+* [Microsoft SQL Server / MSSQL](../integrations/sources/mssql.md)
 
 ## Coming Soon
 
-* [SQL Server / MSSQL](../integrations/sources/mssql.md)
 * Oracle DB
 * Please [create a ticket](https://github.com/airbytehq/airbyte/issues/new/choose) if you need CDC support on another database!