docs(README): add HTTP2 extension and optimize extensions sort order

[L2ncE]

What type of PR is this?

docs

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.

新增 HTTP2 拓展并优化拓展排序顺序。

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

en:

Sort in the following order

• Protocol class extension
• Governance extension
• Authentication class
• Security
• other

zh(optional):

按照以下顺序进行排序

• 协议类扩展
• 治理类扩展
• 鉴权类
• 安全类
• 其它

Which issue(s) this PR fixes:

None.

[codecov]

Codecov Report

Base: 68.28% // Head: 68.36% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (2f29456) compared to base (46e71fc).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #464      +/-   ##
===========================================
+ Coverage    68.28%   68.36%   +0.08%     
===========================================
  Files           92       92              
  Lines         8690     8690              
===========================================
+ Hits          5934     5941       +7     
+ Misses        2395     2388       -7     
  Partials       361      361              

Impacted Files	Coverage Δ
pkg/common/compress/compress.go	83.80% <0.00%> (+2.85%)	⬆️
pkg/common/timer/timer.go	80.95% <0.00%> (+19.04%)	⬆️

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