Added a new constructor to BadRequestException that accepts both a message and an inner exception, enabling improved exception chaining and more detailed error reporting.
- Improved documentation in DIExtensions.cs for clarity.
- Added project reference to DigitalData.Core.Exceptions.
- Updated solution file to include DigitalData.Core.Exceptions.
- Introduced ExceptionHandlingMiddleware for global exception handling.
- Added BadRequestException and NotFoundException classes.
- Created DigitalData.Core.Exceptions project with .NET 7.0, 8.0, and 9.0 support.
