feat: Add bcrypt password hashing and salting for secure authentication

[Parthshukla26]

Code Stack: Node.js, Express.js, MongoDB (assuming based on the use of User model)

Close #1407

Type of PR

• [x] Bug fix
• [X] Feature enhancement
• [x] Documentation update
• [ ] Other (specify): ___

Checklist:

• [X] I have performed a self-review of my code.
• [X] I have commented my code, particularly in hard-to-understand areas.
• [X] I have tested the changes thoroughly before submitting this pull request.
• [x] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [X] I have gone through the contributing.md file before contributing
• [X] I have Starred the Repository.

Additional context:

This change requires updating the bcrypt package in package.json and potentially updating the User model to accommodate longer password hashes. Existing users' passwords will need to be rehashed if implementing these changes in a live system.

Are you contributing under any Open-source programme?

• [x] I am contributing under GSSOC'24 Extended
• [x] I am contributing under Hacktoberfest'24

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[Parthshukla26]

Comment:

This pull request introduces bcrypt password hashing with added salt to enhance security for user authentication. By implementing bcrypt, we ensure that passwords are securely stored and difficult to crack, providing an additional layer of protection against unauthorized access.

Key points:

• bcrypt: A well-established cryptographic algorithm designed for secure password hashing.
• Salting: Random data added to each password before hashing to ensure unique hashes even for identical passwords.

This update is essential for improving the overall security of the authentication process.