Issue-4358: Add Code Linter To utopia-php/messaging

[Rutam21]

What

This PR aims to resolve the issue appwrite/appwrite#4358.

How

• Code Linter has been added to utopia-php/messaging repository.
• All existing files are formatted as per the Linting rules.
• PR Template has been followed as mentioned in Feat: Implement linter ab#7.

Fixes appwrite/appwrite#4358

Have you read the Contributing Guidelines on issues?

• Yes, I have read the Contributing Guidelines on issues.

[Rutam21]

@Meldiron Please review and suggest changes, if any. Thanks.

cc: @stnguyen90 @christyjacob4

[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! 🎃

[stnguyen90]

Hey 👋 awesome work on your PR! We've approved your work and it'll be merged soon!

[christyjacob4]

THANK YOU! All changes merged 🥳

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Please feel free to look for more PRs you might be interested in helping with on our long list of Hacktoberfest friendly issues and help make Appwrite better :)

[DhairyaMajmudar]

Hi @christyjacob4 @stnguyen90 one of my PR has been approved but still not yet merged as of which I am not able to get the hacktoberfest swags please spare some time to merge it.

#54

Thank You : )