Make OPTIONS method on MSC3916 endpoints available without auth (#3431)

OPTIONS method is usually sent by browser in preflight requests, most of
the time we cannot control preflight request to add auth header.

Synapse will return a 204 response directly without authentication for
those OPTIONS method.

According to firefox's documentation, both 200 and 204 are acceptable so
I think there is no need to change handler in dendrite.

This closes https://github.com/matrix-org/dendrite/issues/3424

No need to add a test because this is just a fix and I have tested on my
Cinny Web client personally.

### Pull Request Checklist

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https://matrix-org.github.io/dendrite/development/contributing before
submitting your pull request -->

* [x] I have added Go unit tests or [Complement integration
tests](https://github.com/matrix-org/complement) for this PR _or_ I have
justified why this PR doesn't need tests
* [x] Pull request includes a [sign off below using a legally
identifiable
name](https://matrix-org.github.io/dendrite/development/contributing#sign-off)
_or_ I have already signed off privately

Signed-off-by: `arenekosreal
<17194552+arenekosreal@users.noreply.github.com>`

Signed-off-by: arenekosreal <17194552+arenekosreal@users.noreply.github.com>
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@ -210,6 +210,12 @@ func MakeExternalAPI(metricsName string, f func(*http.Request) util.JSONResponse
// This is used to serve HTML alongside JSON error messages
func MakeHTTPAPI(metricsName string, userAPI userapi.QueryAcccessTokenAPI, enableMetrics bool, f func(http.ResponseWriter, *http.Request), checks ...AuthAPIOption) http.Handler {
withSpan := func(w http.ResponseWriter, req *http.Request) {
if req.Method == http.MethodOptions {
util.SetCORSHeaders(w)
w.WriteHeader(http.StatusOK) // Maybe http.StatusNoContent?
return
}
trace, ctx := internal.StartTask(req.Context(), metricsName)
defer trace.EndTask()
req = req.WithContext(ctx)