Airflow integration

[ItayGabbay]

Reference Issues/PRs

Closes #1411

What does this implement/fix? Explain your changes.

Adding an integration with apache airflow.

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[matanper]

I think the DAG would be more realistic if it had simple model training as a step before the checks. but if it's too complex this is also fine

[shir22]

1. Is it possible for the rst file to take "code blocks" as lines from here?
   (so that in the document it will be a reference to line numbers instead of copy-paste of code...?)
   Worth checking (and if so implementing) for finding a good and maintainable solution for the integration tutorial status (that is currently double...)
2. What's the purpose of this file?
   (Is it quite easy to run it as-is? can we test it?
   and do we think it's simpler than copy-pasting from the docs these code blocks?)

[ItayGabbay]

For 1 - unfortunately, I can't see a good maintainable solution here. If we want explanations within the code it can be an ipynb, and then refer the doc page to a Colab link. If it's a simple Python script - then probably have it inside the RST. I know it's not maintainable, will have to decide what's the best way to do that.

2 - in order to get it tested we need airflow as a dependency, which I don't think will be a good idea. The script itself is quite easy to run assuming you have airflow installed.