Set permissions to GITHUB_TOKEN

[joycebrum]

Description

Setting GITHUB_TOKEN permissions for all workflows.
I was not sure how to flag the type of change.

Fixes #2847

Type of change

• Bug fix
• New Tutorial
• Updated or additional documentation
• Additional Testing
• New Activation and the changes conform to the activation contribution guidelines
• New Callback and the changes conform to the callback contribution guidelines
• New Image addition and the changes conform to the image op contribution guidelines
• New Layer and the changes conform to the layer contribution guidelines
• New Loss and the changes conform to the loss contribution guidelines
• New Metric and the changes conform to the metric contribution guidelines
• New Optimizer and the changes conform to the optimizer contribution guidelines
• New RNN Cell and the changes conform to the rnn contribution guidelines
• New Seq2seq addition and the changes conform to the seq2seq contribution guidelines
• New Text addition and the changes conform to the text op contribution guidelines

Checklist:

• I've properly formatted my code according to the guidelines
  • By running Black + Flake8
  • By running pre-commit hooks
• This PR addresses an already submitted issue for TensorFlow Addons
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• This PR contains modifications to C++ custom-ops

How Has This Been Tested?

The permissions were mostly generated from the Step Security tool, which has a database for actions needed permissions. To the workflows that used github api calls, I've checked the needed permissions by looking at https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs#overview

[bhack]

/cc @mihaimaruseac

[mihaimaruseac]

Need someone from addons to merge it

[bhack]

@mihaimaruseac Thank you for the check

[seanpmorgan]

tyvm!