fix(binding): form binding error on fields of type any

[xiaotushaoxia]

when I want to bind query to any, I got a unknown type error. but it works in BindUri(/:name/:v for example) and BindJSON.
it should be a bug. I fix it.

package main

import (
	"fmt"
	"io"
	"net"
	"net/http"
	"os"
	"time"

	"github.com/gin-gonic/gin"
)

type Req struct {
	Name string `form:"name"`
	V    *any   `form:"v"`
}

func main() {
	// fix(binding): form binding error on fields of type `any`
	stop := newGin() // start server
	time.Sleep(time.Millisecond * 200)
	sendReq("/test?name=234")     // {"Name":"234","V":null}  ok
	sendReq("/test?name=234&v=1") // unknown type !!   want {"Name":"234","V":"1"}. **need fix**
	stop()
}

func newGin() (stopFunc func()) {
	gin.SetMode(gin.ReleaseMode)
	r := gin.New()
	r.GET("/test", func(c *gin.Context) {
		var req Req
		if err := c.ShouldBindQuery(&req); err != nil {
			http.Error(c.Writer, err.Error(), http.StatusBadRequest)
			return
		}
		c.JSON(200, req)
	})
	listen, err := net.Listen("tcp", ":8081")
	if err != nil {
		panic(err)
	}
	var ch = make(chan error, 1)
	go func() {
		ch <- r.RunListener(listen)
	}()
	return func() {
		listen.Close()
		<-ch
	}
}

func sendReq(url string) {
	fmt.Println("send request: ", "http://127.0.0.1:8081"+url)
	req, err := http.NewRequest("GET", "http://127.0.0.1:8081"+url, nil)
	if err != nil {
		fmt.Println(err)
		return
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer resp.Body.Close()
	os.Stdout.Write([]byte("resp:"))
	io.Copy(os.Stdout, resp.Body)
	os.Stdout.Write([]byte("\n"))
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (3dc1cd6) to head (7f4c8c3).
Report is 64 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4005      +/-   ##
==========================================
- Coverage   99.21%   99.06%   -0.16%     
==========================================
  Files          42       44       +2     
  Lines        3182     2772     -410     
==========================================
- Hits         3157     2746     -411     
+ Misses         17       15       -2     
- Partials        8       11       +3     

Flag	Coverage Δ
	?
-tags "sonic avx"	99.05% <100.00%> (?)
-tags go_json	99.05% <100.00%> (?)
-tags nomsgpack	99.04% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	99.06% <100.00%> (-0.16%)	⬇️
go-1.22	99.06% <100.00%> (?)
macos-latest	99.06% <100.00%> (-0.16%)	⬇️
ubuntu-latest	99.06% <100.00%> (-0.16%)	⬇️

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[xiaotushaoxia]

codecov test failed, because 3dc1cd6) is too early. some commits between this commit and 3dc1cd6) make code coverage decrease

[xiaotushaoxia]

@appleboy hello, does this pr looks good? and is this pr can be merged in v1.11?

[xiaotushaoxia]

@appleboy Why no feedback? If PR is bad, close it, if good, merge it.