feat: implements text/event-stream(SSE) MIME parser (#1416)

Co-authored-by: 007gzs <007gzs@gmail.com>

plugins/wasm-rust/example/sse-timing/sse-server/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"time"
+)
+
+var events = []string{
+	": this is a test stream\n\n",
+
+	"data: some text\n",
+	"data: another message\n",
+	"data: with two lines\n\n",
+
+	"event: userconnect\n",
+	"data: {\"username\": \"bobby\", \"time\": \"02:33:48\"}\n\n",
+
+	"event: usermessage\n",
+	"data: {\"username\": \"bobby\", \"time\": \"02:34:11\", \"text\": \"Hi everyone.\"}\n\n",
+
+	"event: userdisconnect\n",
+	"data: {\"username\": \"bobby\", \"time\": \"02:34:23\"}\n\n",
+
+	"event: usermessage\n",
+	"data: {\"username\": \"sean\", \"time\": \"02:34:36\", \"text\": \"Bye, bobby.\"}\n\n",
+}
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		log.Println("receive request")
+		w.Header().Set("Content-Type", "text/event-stream")
+		for _, e := range events {
+			_, _ = w.Write([]byte(e))
+			time.Sleep(1 * time.Second)
+			w.(http.Flusher).Flush()
+		}
+	})
+	if err := http.ListenAndServe("0.0.0.0:8080", nil); err != nil {
+		panic(err)
+	}
+}