rtmp, rtsp: support PROXY protocol (#5754)

Support PROXY protocol v1/v2 on RTMP, RTMPS, RTSP, and RTSPS TCP
listeners so real client IPs are visible when running behind L4 proxies
(nginx stream, HAProxy, AWS NLB).

---------

Co-authored-by: aler9 <46489434+aler9@users.noreply.github.com>

api/openapi.yaml

@@ -449,6 +449,10 @@ components:
           type: array
           items:
             $ref: "#/components/schemas/RTSPAuthMethod"
+        rtspTrustedProxies:
+          type: array
+          items:
+            type: string
         rtspUDPReadBufferSize:
           type: integer
           format: uint64
@@ -472,6 +476,10 @@ components:
           type: string
         rtmpServerCert:
           type: string
+        rtmpTrustedProxies:
+          type: array
+          items:
+            type: string
 
         # HLS server
         hls: