Support .well-known/passkey-endpoints

[leevigraham]

I'm seeing lots of 404's recorded for .well-known/passkey-endpoints. It would be great if Craft handled these out of the box.

SPEC: https://www.w3.org/TR/passkey-endpoints/

I assume this would mean a change to https://github.com/craftcms/cms/blob/5.x/src/web/UrlManager.php#L471-L496

A redirect can't be returned tho. It must be a 200.

[brandonkelly]

Added for 5.11 (#19364).