Enable case-insensitive route parameter binding for enums

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

I have the exact same issue reported in #45590 which has been closed as resolved and locked due to lack of feedback from the author, but the issue is still prevalent in ASP.NET 8+.

The answer provided in that issue was essentially to implement a custom `TryParse`, and the linked documentation shows well enough how to do that; however, the C# language doesn't give us a way to implement static methods on enums.

Is there a way to do this that doesn't require a huge refactor to take a type from `enum` to `class` just to solve this parsing issue?

### Describe the solution you'd like

My desired outcome is a straightfoward (and preferrably not labor-intensive) way to enable case-insensitive route parameter binding for enums, specifically.

### Additional context

_No response_