proxyd: Add logging for origin and remote IP (#3482)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: Mark Tyneway <mark.tyneway@gmail.com>

.changeset/olive-lizards-drive.md

+---
+'@eth-optimism/proxyd': patch
+---
+
+Add logging for origin and remote IP'

proxyd/server.go

@@ -264,6 +264,8 @@ func (s *Server) HandleRPC(w http.ResponseWriter, r *http.Request) {
 		"req_id", GetReqID(ctx),
 		"auth", GetAuthCtx(ctx),
 		"user_agent", userAgent,
+		"origin", origin,
+		"remote_ip", xff,
 	)
 
 	body, err := io.ReadAll(io.LimitReader(r.Body, s.maxBodySize))