[AIRFLOW-XXX] Add protocol operators and hooks table

[mik-laj]

This PR is one of a series about restructuring integration.rst
https://issues.apache.org/jira/browse/AIRFLOW-5431

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[feluelle]

Will check again after the other one is merged :)

[codecov-io]

Codecov Report

Merging #6193 into master will decrease coverage by 0.96%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6193      +/-   ##
==========================================
- Coverage   80.02%   79.05%   -0.97%     
==========================================
  Files         610      610              
  Lines       35176    35176              
==========================================
- Hits        28150    27809     -341     
- Misses       7026     7367     +341

Impacted Files	Coverage Δ
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/kubernetes/kube_client.py	33.33% <0%> (-41.67%)	⬇️
airflow/executors/celery_executor.py	40.74% <0%> (-35.56%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	70.14% <0%> (-28.36%)	⬇️
... and 18 more

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[mik-laj]

Rebased. Now I can start working on transfer operators for protocol, services and services.