Let httpx.Parse() support parsing anonymous field of a struct

[Linde7777]

Is your feature request related to a problem? Please describe.
I am using anonymous field to reduce verbose code, and I found that httpx.Parse() can't go into the anonymous field to parse the tag(like "form", which is used for query parameter)

type UserListRequest struct {
	bizutils.ListReq
	SearchCondition
}

type ListReq struct {
	Page  int64 `form:"page" validate:"required,min=1"`
	Limit int64 `form:"limit" validate:"required,min=5,max=20"`
}

type SearchCondition struct {
	Email       string `form:"email,optional" validate:"omitempty,email"`
	PhoneNumber string `form:"phone_number,optional"`
}

var req types.UserListRequest
if err := httpx.Parse(r, &req); err != nil {
	bizutils.RespBadRequest(w, err)
	return
}

the error will be: field "page" is not set

Describe the solution you'd like
I guess it would be easier to use recursive to implement this feature