[core] Add SEND_RTCP_MESSAGE

We utilize: https://github.com/sipcapture/hepipe.js to monitor RTCP for our calls. As such, it's super helpful to get the sent RTCP data along with the received RTCP data. The new: SEND_RTCP_MESSAGE basically mirrors the existing RECV_RTCP_MESSAGE.

src/include/switch_types.h

@@ -843,6 +843,7 @@ typedef enum {
 	SWITCH_RTP_FLAG_PASSTHRU,
 	SWITCH_RTP_FLAG_SECURE_SEND_MKI,
 	SWITCH_RTP_FLAG_SECURE_RECV_MKI,
+	SWITCH_RTP_FLAG_VIDEO_FIRE_SEND_RTCP_EVENT,
 	SWITCH_RTP_FLAG_INVALID
 } switch_rtp_flag_t;
 
@@ -2037,6 +2038,7 @@ typedef uint32_t switch_io_flag_t;
     SWITCH_EVENT_SEND_INFO
     SWITCH_EVENT_RECV_INFO
     SWITCH_EVENT_RECV_RTCP_MESSAGE
+    SWITCH_EVENT_SEND_RTCP_MESSAGE
     SWITCH_EVENT_CALL_SECURE
     SWITCH_EVENT_NAT            	- NAT Management (new/del/status)
     SWITCH_EVENT_RECORD_START
@@ -2132,6 +2134,7 @@ typedef enum {
 	SWITCH_EVENT_SEND_INFO,
 	SWITCH_EVENT_RECV_INFO,
 	SWITCH_EVENT_RECV_RTCP_MESSAGE,
+	SWITCH_EVENT_SEND_RTCP_MESSAGE,
 	SWITCH_EVENT_CALL_SECURE,
 	SWITCH_EVENT_NAT,
 	SWITCH_EVENT_RECORD_START,