[whatwg/fetch] Can the set of safelisted methods be extended? (Issue #1774)

### What problem are you trying to solve?

There are HTTP methods defined to be "safe" which nevertheless require CORS preflights.

### What solutions exist today?

Non (AFAIU) expect to do the preflight.

### How would you solve it?

Adding to the defined in

  https://fetch.spec.whatwg.org/#cors-safelisted-method
  
In theory we could discuss this for some WebDAV methods as well (PROPFIND etc), but what's more important would be QUERY once it's there.

### Anything else?

_No response_

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