* Bind: return 413 status code when error is `http.MaxBytesError`
The Go standard library includes a method `http.MaxBytesReader` that allows limiting the request body. For example, users can create a middleware like:
```go
func MiddlewareMaxBodySize(c *gin.Context) {
// Limit request body to 100 bytes
c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 100)
c.Next()
}
```
When the body exceeds the limit, reading from the request body returns an error of type `http.MaxBytesError`.
This PR makes sure that when the error is of kind `http.MaxBytesError`, Gin returns the correct status code 413 (Request Entity Too Large) instead of a generic 400 (Bad Request).
* Disable test when using sonic
* Fix
* Disable for go-json too
* Add references to GitHub issues
* Test that the response is 400 for sonic and go-json
