🎉 Source MSSQL: Implement SSH bastion for acceptance/integration tests

[alexandr-shegeda]

Tell us about the problem you're trying to solve

Improve the process of acceptance testing by allowing doing acceptance/integration testing using a bastion running in a docker container. Right now we have a dedicated host in AWS that we use.

Why do we care?

1. We'd rather not maintain the bastion infra if we don't have to
2. It means that the tests require secrets as an input which adds a bit more friction. If we use docker that would not be necessary.
3. It requires having a static instance of the database we trying to test running! Because the bastion is static it also needs to be forwarding to some database in our VPC so we need a statically running db as well. This limits the tests we can right and means we're paying for and maintaining a database for no good reason. Ideally we could spin up dbs and bastion all in docker!

Describe the alternative you’ve considered or used

Example of adding SSH bastion to Postgres source/destination

Note that this PR has way more logic in them than what you'll need to implement for a single connector because they add common helpers and shared libraries and docs