[AIRFLOW-5669] Rename GoogleCloudBaseHook to CloudBaseHook

[michalslowikowski00]

Part of AIP-21

• renamed GoogleCloudBaseHook to CloudBaseHook
• added added to gcp_api_base_hook.py deprecation warning

Jira

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Tests

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[mik-laj]

This PR have conflicts. Can you do rebase?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@5dd1dbc). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #6388   +/-   ##
=========================================
  Coverage          ?   83.96%           
=========================================
  Files             ?      627           
  Lines             ?    36530           
  Branches          ?        0           
=========================================
  Hits              ?    30673           
  Misses            ?     5857           
  Partials          ?        0

Impacted Files	Coverage Δ
airflow/gcp/hooks/cloud_build.py	100% <100%> (ø)
airflow/gcp/hooks/cloud_memorystore.py	73.83% <100%> (ø)
airflow/gcp/hooks/cloud_sql.py	70.23% <100%> (ø)
airflow/gcp/hooks/compute.py	86.86% <100%> (ø)
airflow/gcp/hooks/gcs.py	84.98% <100%> (ø)
airflow/gcp/hooks/tasks.py	92.17% <100%> (ø)
airflow/gcp/hooks/video_intelligence.py	89.47% <100%> (ø)
airflow/gcp/hooks/bigquery.py	70.18% <100%> (ø)
airflow/gcp/hooks/bigquery_dts.py	85.96% <100%> (ø)
airflow/gcp/hooks/dlp.py	98.69% <100%> (ø)
... and 26 more

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[michalslowikowski00]

@mik-laj all conflicts are resolved.