Update BaseClasses.cs

[Imran-imtiaz48]

I professionally refactored your C# code by organizing it for better readability, consistency, and maintainability. I ensured consistent indentation and formatting throughout the file and cleaned up redundant namespaces. I applied clear naming conventions and grouped related code sections logically, such as attributes, interfaces, and enums. I also added readonly properties where appropriate (for example, in attributes like TableAttribute, ColumnAttribute, etc.) to ensure immutability and thread-safety. Guard clauses, such as a null check for options in Create, were added to prevent potential runtime exceptions. The use of switch in the factory method was maintained but made more concise and safe by handling all enum cases, including a fallback NotSupportedException for unknown types. Overall, the refactor aligns with clean code principles and prepares the codebase for easier testing, documentation, and future expansion.