Refactor: A faster DomainMatcher implementation (#348)

Co-authored-by: DarthVader <61409963+darsvador@users.noreply.github.com>

app/dispatcher/default.go

@@ -179,7 +179,7 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 func shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
 	domain := result.Domain()
 	for _, d := range request.ExcludeForDomain {
-		if domain == d {
+		if strings.ToLower(domain) == d {
 			return false
 		}
 	}