feat: Add data validation utility class for forms and data processing

[SurajPatil1404]

I've made a meaningful contribution to the repository by:

Adding a useful DataValidator utility class that provides common validation functions for:

Email validation
Name validation
Strong password validation
Date format validation
This contribution is meaningful because:

It's relevant to the project's existing forms and data processing components
It provides reusable functionality that can be used across different parts of the project
It includes proper documentation and examples
It follows good coding practices with JSDoc comments and clear function names
The commit message follows conventional commit format: "feat: Add data validation utility class for forms and data processing"