[GitHub] [airflow] BasPH opened a new pull request #5832: [AIRFLOW-5230] Refactor template file loading functionality

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BasPH opened a new pull request #5832: [AIRFLOW-5230] Refactor template file loading functionality
URL: https://github.com/apache/airflow/pull/5832
 
 
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-5230
     - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
     - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).
     - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   Following https://issues.apache.org/jira/browse/AIRFLOW-4835, I've also refactored the template file loading functionality to:
   
   - Avoid building multiple Jinja environments
   - Avoid code duplication around `env.loader.get_source`
   - Rename `resolve_template_files` to `load_template_files` which follows the Jinja naming
   - Support other collection types for storing template file paths (tuple, namedtuple, dict and set)
   - Add tests for all types
   - Move related test from `core.py` to `test_baseoperator.py`
   - Adhere to 110 char line length
   - Add Pydoc
   - Add typing
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   Few tests in `test_baseoperator.py` to test providing template filepaths in various data structures (dict, list, str, etc...), and moved a test from `core.py` to `test_baseoperator.py`.
   
   ### Commits
   
   - [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   ### Code Quality
   
   - [ ] Passes `flake8`
   

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