[enhancement] Models enhancement, adding timestamp and using trim true

[krishaarya]

The current Admin schema in our project could benefit from several enhancements to improve data integrity, security, and performance. Here are proposed changes to make the schema more robust:

1. Add timestamps: Automatically include createdAt and updatedAt fields to track record creation and updates.
2. Add trim to String fields: Removes unnecessary whitespace from user inputs for name, facultyid, email, etc.
3. Set required fields: Enforce mandatory fields like name, email, facultyid, and password for data consistency.
4. Add unique constraints: Ensure that facultyid and email are unique to prevent duplicate entries. (4th is optional)