feat: implement check update hook

[WilliamBergamin]

Summary

This PR aim to introduce the implementation of the check-update hook

Testing

1. follow the instructions in the readme in order to create and app
2. run slack update
   a. Their should be no errors and nothing to update
3. run pip install pip install slack-sdk==3.25.0
4. run slack update
   a. The CLI should inform you that and update for slack_sdk is available

Special notes

Areas of feedback:

• code cleanliness
• approach
• should we include other fields to return to the CLI

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_and_run_tests.sh after making the changes.

[WilliamBergamin]

This resolves #7