Removed unnecessary instances and simplified LogProviders + RuntimeOptions

[sandrohanea]

This pull request includes several changes to improve logging and workflow behavior. The most important changes involve replacing the LogProvider with WhisperLogger and ensuring that test result files are uploaded regardless of test success or failure.

Logging Improvements:

• Replaced instances of LogProvider.Log with WhisperLogger.Log in CudaHelper.cs, NativeLibraryLoader.cs, and RuntimeOptions.cs to standardize logging. [1] [2] [3] [4] [5] [6] [7] [8]
• Refactored LogProvider to be a static class and moved logging logic to a new internal WhisperLogger class. [1] [2] [3]
• Changed the way to register loggers to LogProvider.AddLogger which now returns an IDisposable for easy cleanup instead of using events.

Workflow Enhancements:

• Updated .github/workflows/dotnet.yml to upload trx files even if the previous step fails, ensuring test results are always available. [1] [2] [3]

Configuration Improvements:

• Refactored RuntimeOptions from an instance-based class to a static class, simplifying the configuration of runtime options. [1] [2]

Example Update:

• Updated the CoreML example to use the new WhisperLogger for logging.