feat(homekit): add ONVIF motion detection support

- implement ONVIF motion watcher to handle motion events
- add configuration options for motion hold time and ONVIF URL
- remap motion mode from "onvif" to "api" for compatibility
- log ONVIF motion watcher activity for better debugging

feat(onvif): implement event subscription for motion detection
- create PullPoint subscription to receive motion events
- implement methods for pulling messages and renewing subscriptions
- handle event requests and responses specific to motion detection

test(onvif): add unit tests for motion event parsing and subscription
- create tests for parsing various motion event XML responses
- verify correct handling of multiple notifications and edge cases
- test resolving event addresses for ONVIF clients

fix(hksv): improve motion detection logging
- log warnings when accessory or character not found during motion detection
- log number of listeners notified during motion state changes

feat(hap): add listener count method
- introduce method to retrieve the number of listeners for a character

feat(onvif): enhance ONVIF client with event URL handling
- extract event URL from ONVIF device response for subscription management

pkg/onvif/client.go

@@ -20,6 +20,7 @@ type Client struct {
 	deviceURL string
 	mediaURL  string
 	imaginURL string
+	eventURL  string
 }
 
 func NewClient(rawURL string) (*Client, error) {
@@ -44,6 +45,11 @@ func NewClient(rawURL string) (*Client, error) {
 	s = FindTagValue(b, "Imaging.+?XAddr")
 	client.imaginURL = baseURL + GetPath(s, "/onvif/imaging_service")
 
+	s = FindTagValue(b, "Events.+?XAddr")
+	if s != "" {
+		client.eventURL = baseURL + getURLPath(s, "/onvif/event_service")
+	}
+
 	return client, nil
 }