feat(http1): support flush chunk in handler

[welkeyever]

What type of PR is this?

feat

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.

(Optional) Translate the PR title into Chinese.

支持在handler中按chunk flush数据

(Optional) More detail description for this PR(en: English/zh: Chinese).

en:

1. Support hijack for writer of response
2. Provide a impl for chunk-flushing writer for http/1.1

zh(optional):

1. response 支持writer劫持
2. 提供一个支持按chunk块flush的writer实现

Which issue(s) this PR fixes:

None

[codecov]

Codecov Report

Base: 72.12% // Head: 72.06% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (2a4f79d) compared to base (e4cc656).
Patch coverage: 55.88% of modified lines in pull request are covered.

❗ Current head 2a4f79d differs from pull request most recent head b958f70. Consider uploading reports for the commit b958f70 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #610      +/-   ##
===========================================
- Coverage    72.12%   72.06%   -0.07%     
===========================================
  Files           94       96       +2     
  Lines         9234     9385     +151     
===========================================
+ Hits          6660     6763     +103     
- Misses        2155     2189      +34     
- Partials       419      433      +14     

Impacted Files	Coverage Δ
pkg/app/fs.go	68.65% <ø> (ø)
pkg/common/test/mock/network.go	0.00% <0.00%> (ø)
pkg/common/test/mock/writer.go	0.00% <0.00%> (ø)
pkg/network/writer.go	95.65% <ø> (ø)
pkg/protocol/http1/ext/stream.go	14.37% <42.30%> (+14.37%)	⬆️
pkg/protocol/http1/ext/common.go	25.16% <47.72%> (+4.03%)	⬆️
pkg/app/context.go	85.24% <71.87%> (+0.94%)	⬆️
pkg/protocol/http1/resp/writer.go	72.72% <72.72%> (ø)
pkg/protocol/response.go	85.29% <95.65%> (+1.18%)	⬆️
pkg/protocol/http1/server.go	62.67% <100.00%> (+0.36%)	⬆️
... and 2 more

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