Added Precision & Recall Metrics with average and threshold parameter

[minesh1291]

Description

Brief Description of the PR:

Fixes # (issue)

Type of change

• [x] New Metric and the changes conform to the metric contribution guidelines

Checklist:

• [x] I've properly formatted my code according to the guidelines
  • [x] By running Black + Flake8
  • [x] By running pre-commit hooks
• [x] I have made corresponding changes to the documentation

How Has This Been Tested?

If you're adding a bugfix or new feature please describe the tests that you ran to verify your changes: *

[bot-of-gabrieldemarmiesse]

@marload @ssaishruthi

You are owners of some files modified in this pull request. Would you kindly review the changes whenever you have the time to? Thank you very much.

[minesh1291]

do I have to take any action to push this forward!

[bhack]

I think this component is orphan. Are you interested to be a codeowner?

[minesh1291]

Yes, I will be interested.

[bhack]

@minesh1291 Before we change the codeowner can you open a ticket in https://github.com/keras-team/keras

So we could check if they are interested to maintain your PR there.

[seanpmorgan]

Thank you for your contribution. We sincerely apologize for any delay in reviewing, but TensorFlow Addons is transitioning to a minimal maintenance and release mode. New features will not be added to this repository. For more information, please see our public messaging on this decision: TensorFlow Addons Wind Down

Please consider sending feature requests / contributions to other repositories in the TF community with a similar charters to TFA: Keras Keras-CV Keras-NLP