[AIRFLOW-6054] Add a command that starts the database consoles

[mik-laj]

@potiuk This will be a very nice improvement for development environment including Breeze.

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[codecov-io]

Codecov Report

Merging #6653 into master will decrease coverage by 0.84%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6653      +/-   ##
==========================================
- Coverage   83.82%   82.97%   -0.85%     
==========================================
  Files         672      672              
  Lines       37560    37584      +24     
==========================================
- Hits        31483    31186     -297     
- Misses       6077     6398     +321

Impacted Files	Coverage Δ
airflow/bin/cli.py	92.64% <ø> (ø)	⬆️
airflow/cli/commands/db_command.py	97.43% <100%> (+17.43%)	⬆️
airflow/operators/postgres_operator.py	0% <0%> (-100%)	⬇️
airflow/operators/mysql_operator.py	0% <0%> (-100%)	⬇️
airflow/operators/mysql_to_hive.py	0% <0%> (-100%)	⬇️
airflow/operators/generic_transfer.py	0% <0%> (-100%)	⬇️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/executors/celery_executor.py	41.04% <0%> (-35.08%)	⬇️
... and 14 more

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[turbaszek]

I like the idea!

[msumit]

nice addition. lgtm.

[potiuk]

Hey @mik-laj - looks fantastic.

One small thing -> I think it's worth adding a mention in LOCAL_VIRTUALENV.rst - adding a separate "Connecting to database" chapter in "Debugging and Running Tests". We have a change in progress to separate out a TESTING.rst in #6585 with @efedotova so we will rebase and incorporate content of this chapter in this change after you merge it.

[mik-laj]

@potiuk Done. I added a mention in LOCAL_VIRTUALENV.rst.

[potiuk]

Fantastic!