Rewrote the `ExceptionHandlingMiddleware` class to improve structure and functionality, changing its namespace to `DigitalData.Core.Exceptions`. Updated the constructor to support a nullable logger and implemented null-conditional logging for unhandled exceptions. Added new package references in `DigitalData.Core.Exceptions.csproj` for `Microsoft.AspNetCore.Http.Abstractions` and `Microsoft.Extensions.Logging.Abstractions`. Introduced a new `DependencyInjection` class to register the middleware in the application's pipeline.
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