[AIRFLOW-5674][WIP] rename GoogleCloudKMSHook to CloudKmsHook

[michalslowikowski00]

Part of AIP-21

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[codecov-io]

Codecov Report

Merging #6408 into master will decrease coverage by 0.56%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6408      +/-   ##
==========================================
- Coverage   80.61%   80.05%   -0.57%     
==========================================
  Files         626      626              
  Lines       36224    36228       +4     
==========================================
- Hits        29203    29002     -201     
- Misses       7021     7226     +205

Impacted Files	Coverage Δ
airflow/contrib/hooks/gcp_kms_hook.py	100% <100%> (ø)	⬆️
airflow/gcp/hooks/kms.py	100% <100%> (ø)	⬆️
airflow/operators/postgres_operator.py	0% <0%> (-100%)	⬇️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/executors/sequential_executor.py	47.61% <0%> (-52.39%)	⬇️
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%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	70.14% <0%> (-28.36%)	⬇️
airflow/utils/log/colored_log.py	72.72% <0%> (-20.46%)	⬇️
... and 9 more

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[mik-laj]

If we use shortcuts, we should write them Capitalized e.g. GKE, GCS

https://docs.google.com/document/d/1_rTdJSLCt0eyrAylmmgYc3yZr-_h51fVlnvMmWqhCkY/edit?ts=5bb72dfd#

We need to update our planned changes

[mik-laj]

If we use shortcuts, we should write them Capitalized e.g. GKE, GCS

https://docs.google.com/document/d/1_rTdJSLCt0eyrAylmmgYc3yZr-_h51fVlnvMmWqhCkY/edit?ts=5bb72dfd#

We need to update our planned changes

[mik-laj]

Can you also update a note in UPDATING.md file?
https://github.com/apache/airflow/blob/master/UPDATING.md#changes-to-import-paths-and-names-of-gcp-operators-and-hooks

[michalslowikowski00]

@mik-laj Should I change the name to CloudKMSHook?