filter work flow rafactor

[mark4z]

What this PR does:
Http Filter的生命周期现在变更为3个阶段
1.HttpFilterPlugin 可以认为是Filter工厂的工厂，CreateFilterFactory()用于注册自己
2.HttpFilterFactory Filter工厂函数，被filter_manager持有，内部会包含创建Filter所需的配置
3.当请求来临，filter_manager会创建一个filter_chain，同步调用每一个HttpFilterFactory.PrepareFilterChain(), 由HttpFilterFactory生成Filter实例并添加到链中
一个例子:

func (f *DemoFilterFactory) PrepareFilterChain(ctx *contexthttp.HttpContext, chain FilterChain) error {
	c := f.conf
	str := fmt.Sprintf("%s is drinking in the %s", c.Foo, c.Bar)
	filter := &DemoFilter{str: str}

	chain.AppendDecodeFilters(filter)
	chain.AppendEncodeFilters(filter)
	return nil
}

Which issue(s) this PR fixes:

Fixes #253

Special notes for your reviewer:
从pkg/common/http/manager.go:70开始看，会非常直观

// handleHTTPRequest handle http request
func (hcm *HttpConnectionManager) handleHTTPRequest(c *pch.HttpContext) {
	filterChain := hcm.filterManager.CreateFilterChain(c)

	// recover any err when filterChain run
	defer func() {
		if err := recover(); err != nil {
			logger.Warnf("[dubbopixiu go] Occur An Unexpected Err: %+v", err)
			c.SendLocalReply(http.StatusInternalServerError, []byte(fmt.Sprintf("Occur An Unexpected Err: %v", err)))
		}
	}()

	//todo timeout
	filterChain.OnDecode(c)
	hcm.buildTargetResponse(c)
	filterChain.OnEncode(c)
	hcm.writeResponse(c)
}

Does this PR introduce a user-facing change?:

[mark4z]

#253

[codecov-commenter]

Codecov Report

Merging #307 (707a632) into develop (04933a9) will increase coverage by 2.11%.
The diff coverage is 45.16%.

@@             Coverage Diff             @@
##           develop     #307      +/-   ##
===========================================
+ Coverage    36.78%   38.89%   +2.11%     
===========================================
  Files           54       53       -1     
  Lines         3262     3121     -141     
===========================================
+ Hits          1200     1214      +14     
+ Misses        1938     1778     -160     
- Partials       124      129       +5     

Impacted Files	Coverage Δ
pkg/client/response.go	0.00% <0.00%> (ø)
pkg/common/extension/filter/filter.go	29.16% <ø> (ø)
pkg/common/util/response.go	46.29% <0.00%> (ø)
pkg/context/http/context.go	0.00% <0.00%> (-6.67%)	⬇️
pkg/filter/host/host.go	41.17% <20.00%> (-2.58%)	⬇️
pkg/filter/header/header.go	25.80% <23.07%> (-40.87%)	⬇️
pkg/filter/metric/metric.go	34.21% <43.75%> (-30.50%)	⬇️
pkg/filter/accesslog/access_log.go	54.41% <44.44%> (+48.25%)	⬆️
pkg/common/http/manager.go	54.09% <44.73%> (-12.57%)	⬇️
pkg/filter/http/proxyrewrite/rewrite.go	53.33% <47.61%> (ø)
... and 11 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 04933a9...707a632. Read the comment docs.

[AlexStocks]

@mark4z plx fix the github action bugs

[ztelur]

Thanks for preparing the PR! rest LGTM

[mark4z]

@mark4z plx fix the github action bugs

Approve pls

[PhilYue]

状态变更这里是否要加日志，方便排查定位

[PhilYue]

Case：如果我自定义的 Filter 没有成对的 Append Encode 和 Decode，比如只 chain.AppendDecodeFilters(f)，对 Filter 整体执行结果有什么影响？