enhance spider with rate limit handling, follow list updates, and improved reconnect logic; bump version to v0.29.0

also reduces CPU load for spider, and minor CORS fixes

pkg/protocol/ws/client.go

@@ -111,6 +111,7 @@ type RelayOption interface {
 var (
 	_ RelayOption = (WithCustomHandler)(nil)
 	_ RelayOption = (WithRequestHeader)(nil)
+	_ RelayOption = (WithNoticeHandler)(nil)
 )
 
 // WithCustomHandler must be a function that handles any relay message that couldn't be
@@ -128,6 +129,18 @@ func (ch WithRequestHeader) ApplyRelayOption(r *Client) {
 	r.requestHeader = http.Header(ch)
 }
 
+// WithNoticeHandler must be a function that handles NOTICE messages from the relay.
+type WithNoticeHandler func(notice []byte)
+
+func (nh WithNoticeHandler) ApplyRelayOption(r *Client) {
+	r.notices = make(chan []byte, 8)
+	go func() {
+		for notice := range r.notices {
+			nh(notice)
+		}
+	}()
+}
+
 // String just returns the relay URL.
 func (r *Client) String() string {
 	return r.URL