Add CloudSQLCloneInstanceOperator

[FloMom]

Created CloudSQLCloneInstanceOperator to provide a simple way of cloning a cloudSQL instance from a DAG.

It is making use of google's instance.clone method as described here: https://cloud.google.com/sql/docs/mysql/admin-api/rest/v1/instances/clone

[boring-cyborg]

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[potiuk]

tests/static checks are failing

[eladkal]

What is the motivation to add new operator without example?
Is there a difficulty in creating the example dag?
Out goal is to reduce this list not to make it bigger.

[FloMom]

Good point. Thank you for the hint. I updated the associated example DAG to demonstrate usage of the CloudSQLCloneInstanceOperator.

[eladkal]

Great. We are almost there. The example was created but it is not referenced in the docs so users can't find it.
See our docs https://airflow.apache.org/docs/apache-airflow-providers-google/stable/operators/cloud/cloud_sql.html

You need to add a short description in the docs and refer to the example you wrote.
The relevant file to edit is:
https://github.com/apache/airflow/blob/main/docs/apache-airflow-providers-google/operators/cloud/cloud_sql.rst

[FloMom]

all right. Thank you for pointing me to the right files. I updated the PR accordingly.

[eladkal]

@FloMom static checks are failing :(

[boring-cyborg]

Awesome work, congrats on your first merged pull request!