feat: support group now (close #17, close #72, close #85, close #104, close #136)

Co-authored-by: quzard <1191890118@qq.com>

common/gin.go

@@ -0,0 +1,26 @@
+package common
+
+import (
+	"bytes"
+	"encoding/json"
+	"github.com/gin-gonic/gin"
+	"io"
+)
+
+func UnmarshalBodyReusable(c *gin.Context, v any) error {
+	requestBody, err := io.ReadAll(c.Request.Body)
+	if err != nil {
+		return err
+	}
+	err = c.Request.Body.Close()
+	if err != nil {
+		return err
+	}
+	err = json.Unmarshal(requestBody, &v)
+	if err != nil {
+		return err
+	}
+	// Reset request body
+	c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
+	return nil
+}