access log: add support downstream direct remote address (#8278)

Signed-off-by: Lizan Zhou <lizan@tetrate.io>

Mirrored from https://github.com/envoyproxy/envoy @ 1f8c137605326f7c04e1eb1c1e503cae43360bfb

envoy/data/accesslog/v2/accesslog.proto

@@ -153,6 +153,11 @@ message AccessLogCommon {
 
   // The name of the route
   string route_name = 19;
+
+  // This field is the downstream direct remote address on which the request from the user was
+  // received. Note: This is always the physical peer, even if the remote address is inferred from
+  // for example the x-forwarder-for header, proxy protocol, etc.
+  envoy.api.v2.core.Address downstream_direct_remote_address = 20;
 }
 
 // Flags indicating occurrences during request/response processing.