add pr labeler workflow to label based on files changed

[jwetzell]

Description

Adds github workflow to label pull requests based on the files changed.

Feel free to adjust the labels in the labeler.yml file.

Information about the action can be found here.

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have read the contribution guidelines.

[helloanoop]

@jwetzell Is this still needed since we have already installed the Github App for taking care of PR Size labelling ?

[jwetzell]

@helloanoop that is up to you and your team. If you look at the linked information you can see how this differs from labeling based on size.