Add code quality analysis with PHPStan

[abhishekdd]

Closes 🔎 Add Code Analyzer To ‘utopia-php/storage’ #4374

Implements code quality analysis into the repository. This allows running composer check to check for errors. Also auto-checks every PR with composer check to create failed test if there are code quality issues.

This PR also fixes the code quality issues identified by PHPStan up to analysis level 5.

[christyjacob4]

Please sync your branch with main . It has fixes for the failing CI tests

[stnguyen90]

@abhishekdd would you please sync with main and fix the merge conflicts?

[PineappleIOnic]

Thank you so much for the PR 🤩. We're adding the hacktoberfest-accepted label to ensure this PR counts towards your Hacktoberfest contributions count. With that said, please stay active on this PR to address any comments once you receive a review. Happy Hacktoberfest! 🎃

[christyjacob4]

@abhishekdd thanks a lot for your contributions during Hacktoberfest 2022!

Please reach out to me on our Discord server if you would like to claim your Appwrite swags! As a way of saying thank you, we would also love to invite you to join the Appwrite organization on GitHub. Please share your GitHub username with us on Discord. 

[stnguyen90]

@abhishekdd would you be able to fix the merge conflicts so we can merge this in?