feat: support query value list/array as url parameter

[ch3nnn]

Sending via URL:
List of values can be passed via URL like this:

http://localhost:8080/test/?userId=1&userId=2&username=admin&password=

OR

http://localhost:8080/test/?userId=[1,2]&username=admin

help to review it. thank! @kevwan @kesonan

[ch3nnn]

I find current version support http://localhost:8080/test/?userId=[1,2]&username=["admin", "zhangsan"]

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---

I find current version support http://localhost:8080/test/?userId=[1,2]&username=["admin", "zhangsan"]

[ch3nnn]

v1.6.3 support.

https://github.com/zeromicro/go-zero/blob/v1.6.3/rest/httpx/requests_test.go#L17

func TestParseForm(t *testing.T) {
	var v struct {
		Name    string   `form:"name"`
		Age     int      `form:"age"`
		Percent float64  `form:"percent,optional"`
		Role    []string `form:"role"`
		Ids     []int64  `form:"ids"`
	}

	r, err := http.NewRequest(http.MethodGet, `/a?name=hello&age=18&percent=3.4&role=["admin", "teacher", "student"]&ids=[1]`, http.NoBody)
	assert.Nil(t, err)
	assert.Nil(t, Parse(r, &v))
	assert.Equal(t, "hello", v.Name)
	assert.Equal(t, 18, v.Age)
	assert.Equal(t, 3.4, v.Percent)
	assert.Equal(t, 3, len(v.Role))
	assert.Equal(t, []string{"admin", "teacher", "student"}, v.Role)
	assert.Equal(t, []int64{1}, v.Ids)
}

unit test pass

=== RUN   TestParseForm
--- PASS: TestParseForm (0.00s)
PASS

need attention parse []string format url keyword must be included with ""