Add guide for Apache Druid operators

[Jasonnor]

Features

• Create example DAG of DruidOperator
• Create Druid operators page

Related Issues

• Closes Guide for Apache Druid operators  #8199

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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
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In case of backwards incompatible changes please leave a note in UPDATING.md.

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst)
Here are some useful points:

• Pay attention to the quality of your code (flake8, mypy and type annotations). Our pre-commits will help you with that.
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[github-actions]

The PR is likely OK to be merged with just subset of tests for default Python and Database versions without running the full matrix of tests, because it does not modify the core of Airflow. If the committers decide that the full tests matrix is needed, they will add the label 'full tests needed'. Then you should rebase to the latest main or amend the last commit of the PR, and push it with --force-with-lease.

[potiuk]

Random, intermittent error (139 - indicating out of memory on cleanup) . But It looks good!

[boring-cyborg]

Awesome work, congrats on your first merged pull request!

[potiuk]

Thanks @Jasonnor ! That makes it 5 PRs merged after the workshop!

[Jasonnor]

@potiuk Thank you very much too, I learned a lot today! 😄