[CI] Add Auto PR Labeler

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Summary

Add auto PR labeler according to current use cases.

Links

• GitHub Action Extension:
  srvaroa/labeler: Label manager for PRs and Issues based on configurable conditions

Changes

• Auto apply labels to future PRs based on the following PR title conditions:

  Label	PR Title Regex
  bugfix	(?i)fix|bug
  documentation	(?i)docs|documentation
  enhancement	(?i)feat|feature|enhance|improve
  plugin	(?i)plugin
  test	(?i)test

• Clone PR to [CI] Add Auto PR Labeler in Python repo.

Dev Testing

Can be tested over the private test repo.

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