Feat: Use embed instead of packr2

[ifooth]

issue: #130

[tming]

基本功能看上去是正常的，后面还需要对比下性能，确认下性能不受影响

[ifooth]

benchmark

[ifooth]

benchmark code

/*
 * Copyright (c) 2021 THL A29 Limited, a Tencent company. All rights reserved
 *
 * This source code file is licensed under the MIT License, you may obtain a copy of the License at
 *
 * http://opensource.org/licenses/MIT
 *
 */

package static

import (
	"io"
	"testing"

        // slower
	// _ "github.com/TencentBlueKing/bk-turbo/src/backend/booster/bk_dist/dashboard/static/packrd"
	"github.com/gobuffalo/packr/v2"
)

func BenchmarkStatsFS(b *testing.B) {
	staticFS, err := StatsFS()
	if err != nil {
		panic(err)
	}

	for i := 0; i < b.N; i++ {
		f, err := staticFS.Open("index.html")
		if err != nil {
			panic(err)
		}

		_, err = io.Copy(io.Discard, f)
		if err != nil {
			panic(err)
		}
	}
}

func BenchmarkPackr2(b *testing.B) {
	box := packr.New("dashboard_box", "./stats")

	for i := 0; i < b.N; i++ {
		f, err := box.Open("index.html")
		if err != nil {
			panic(err)
		}

		_, err = io.Copy(io.Discard, f)
		if err != nil {
			panic(err)
		}
	}
}