feat: edit monitors + notification channels; HTTP monitor insecure-TLS option

agent/internal/grpc/pb/vantage.pb.go

@@ -104,6 +104,7 @@ type MonitorSpec struct {
 	ExpectedStatus int    `json:"expected_status,omitempty"`
 	Keyword        string `json:"keyword,omitempty"`
 	TLSWarnDays    int    `json:"tls_warn_days,omitempty"`
+	Insecure       bool   `json:"insecure,omitempty"`
 	IntervalSec    int    `json:"interval_sec"`
 	Retries        int    `json:"retries"`
 }