chore: Enforce pnpm as the package manager in package.json (fixes #366)

[itsaryan72]

User description

GENERAL: Only allow PNPM #366

#description Restriction on Package Manager Usage To ensure consistency in our project, I've added a preinstall script in package.json. "preinstall": "if [[ "$npm_config_user_agent" != pnpm ]]; then echo 'This project uses pnpm. Please run using pnpm.'; exit 1; fi",

This script checks the package manager before installation and displays an error if anything other than PNPM is used, promoting uniformity among contributors.

Fixes #366 GENERAL: Only allow PNPM #366

Dependencies

No additional packages or dependencies are required for the preinstall script

Developer's checklist

• [Y] My PR follows the style guidelines of this project
• [Y] I have performed a self-check on my work

If changes are made in the code:

• [Y] I have followed the coding guidelines
• [Y] My changes in code generate no new warnings
• [ ] My changes are breaking another fix/feature of the project
• [ ] I have added test cases to show that my feature works
• [ ] I have added relevant screenshots in my PR
• [Y] There are no UI/UX issues

Documentation Update

• [ ] This PR requires an update to the documentation at docs.keyshade.xyz
• [ ] I have made the necessary updates to the documentation, or no documentation changes are required.

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PR Type

enhancement, configuration changes

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Description

• Added a preinstall script in package.json to enforce the use of PNPM as the package manager.
• The script checks the npm_config_user_agent and exits with an error message if a package manager other than PNPM is used.
• This change ensures consistency and uniformity among contributors by restricting package manager usage.

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Changes walkthrough 📝

	Relevant files
Configuration changes	package.json Enforce PNPM as the package manager in preinstall script  package.json Added a preinstall script to enforce the use of PNPM. The script checks the package manager and exits with an error if not PNPM. +1/-0

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