Add pr labeller action

[chrismclarke]

PR Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

PR Checklist

• - Latest master branch merged
• - PR title descriptive (can be used in release notes)
• - Passes Tests

Description

Add github action to automatically label PRs depending on what files have changed to help with reviews.

Git Issues

Closes #

Screenshots/Videos

If useful, provide screenshot or capture to highlight main changes

[chrismclarke]

Code only changes ci actions so merging without tests (which are broken due to recent travis changes)