Description:
It would be nice if we could use this action to set up a step that would label PRs based on their title.
Take feat(xxx): something and fix(yyy): something else as examples.
We can write a configuration like this:

T-feat:
  - pr-title: "^feat"

T-fix:
 - pr-title: "^fix"

And get respective labels on PRs based on their titles.

Justification:
Allows automation for workflows that have PR naming conventions and we already have something similar with the branch names, So if there isn't an API restriction making it impossible it can be a useful addition.

Are you willing to submit a PR?
Yes