Allow a constructor with parameters for model validation classes

[MartinZid]

Summary

Model validation class should be allowed to have a constructor with parameters - now the validation ends with the InvalidOperationException.

(There is a related pull request for record type #23976).

Motivation and goals

The constructor would allow us to use non-nullable properties as Required without the worry about the

Warning CS8618 Non-nullable property '<Property>' is uninitialized.

Examples

The usage would be simple:

public class Headers
{
  [FromHeader]
  public string MyPath { get; set; }

  public Headers(string myPath)
  {
    MyPath = myPath;
  }
}

Without the need to disable warning CS8618 or write something like public string MyPath { get; set; } = null!;

Usage in the controller would still be the same.

[ApiController]
[Route("ep")]
public class MyController : ControllerBase
{
  [HttpPost]
  public Task EpAction([FromHeader] Headers headers)
  {
    ...
  }
}