feat: Add an AI-Proxy Wasm plugin (#921)

Co-authored-by: 澄潭 <zty98751@alibaba-inc.com>

plugins/wasm-go/extensions/ai-proxy/util/json.go

@@ -0,0 +1,22 @@
+package util
+
+import (
+	"strconv"
+	"strings"
+)
+
+func EscapeStringForJson(s string) string {
+	var builder strings.Builder
+	for _, c := range s { //iterate through rune
+		switch c {
+		case '"':
+			builder.WriteRune('\\')
+			builder.WriteRune(c)
+			break
+		default:
+			quoted := strconv.QuoteRune(c)
+			builder.WriteString(quoted[1 : len(quoted)-1])
+		}
+	}
+	return builder.String()
+}