Enhancement: Add support for WebDAV methods

[sfermigier]

Summary

I'd like to use Litestar to implement a WebDAV server.

It's not possible to use the following HTTP methods:

PROPFIND, MKCOL, COPY, MOVE, LOCK, UNLOCK, and PROPPATCH.

The problem is in file litestar/handlers/http_handlers/_utils.py and more specially method normalize_http_method() which raises a ValidationException when passed one of these methods.

Basic Example

No response

Drawbacks and Impact

No response

Unresolved questions

No response

[euri10]

not an easy one to answer, it looks not hard to add but at the same time i have no idea if that would imply a maintenance burden for a very niche and specific usecase,

the asgi spec being pretty agnostic on the http methods, so i dont see a reason we should be that strict,