chore: improve .NET mock server

[olavloite]

Add some improvements to the .NET mock server. These features are used by the ADO.NET driver tests.

[olavloite]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces several enhancements to the .NET mock server, such as configurable database dialects, waiting for specific requests, and handling larger messages. While these are valuable additions for testing, I've found a couple of high-severity issues related to performance and thread-safety in the new helper methods. I've also noted a minor issue with a magic number. My review includes specific code suggestions to address these points, aiming to improve the robustness and efficiency of the mock server.

[gemini-code-assist]

The value 100_000_000 is used here as a magic number. To improve readability and maintainability, it's recommended to extract it into a named constant. You could define a private constant at the class level:

private const int MaxRequestBodySize = 100_000_000;

And then use it here:

options.Limits.MaxRequestBodySize = MaxRequestBodySize;

This makes the code more self-documenting and easier to manage.

[olavloite]

Done