[AIRFLOW-6670][depends on AIRFLOW-6669] Move contrib operators to providers package

[mik-laj]

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Issue link: AIRFLOW-6670

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• Description above provides context of the change
• Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
• Unit tests coverage for changes (not needed for documentation changes)
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• Relevant documentation is updated including usage instructions.
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^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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[codecov-io]

Codecov Report

Merging #7286 into master will increase coverage by 0.03%.
The diff coverage is 87.39%.

@@            Coverage Diff            @@
##           master   #7286      +/-   ##
=========================================
+ Coverage   85.46%   85.5%   +0.03%     
=========================================
  Files         851     864      +13     
  Lines       40403   40455      +52     
=========================================
+ Hits        34532   34592      +60     
+ Misses       5871    5863       -8

Impacted Files	Coverage Δ
airflow/operators/s3_to_hive_operator.py	0% <0%> (-93.97%)	⬇️
airflow/operators/mysql_to_hive.py	0% <0%> (-100%)	⬇️
...flow/contrib/example_dags/example_gcs_to_gdrive.py	100% <100%> (ø)	⬆️
...roviders/microsoft/azure/operators/file_to_wasb.py	100% <100%> (ø)
airflow/operators/mssql_to_hive.py	100% <100%> (ø)	⬆️
...s/google/suite/operators/gcs_to_gdrive_operator.py	100% <100%> (ø)
...irflow/contrib/operators/gcs_to_gdrive_operator.py	100% <100%> (ø)	⬆️
airflow/operators/hive_to_druid.py	100% <100%> (+34.84%)	⬆️
airflow/contrib/operators/vertica_to_mysql.py	100% <100%> (+13.23%)	⬆️
...ib/operators/oracle_to_azure_data_lake_transfer.py	100% <100%> (+2.27%)	⬆️
... and 30 more

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