fix: ignore body should not set content-length

[byene0923]

What type of PR is this?

fix

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

en: can refer to valyala/fasthttp#1022, fasthttp only handle ContinueReadBody(), this pr also handle ContinueReadBodyStream()
zh(optional): fasthttp 只处理了 ContinueReadBody(), 这里添加了对 ContinueReadBodyStream() 的处理 和 测试

Which issue(s) this PR fixes:

close #320

[codecov]

Codecov Report

Base: 66.14% // Head: 66.13% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (4211ea3) compared to base (3a83d2e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #321      +/-   ##
===========================================
- Coverage    66.14%   66.13%   -0.01%     
===========================================
  Files           85       85              
  Lines         8317     8319       +2     
===========================================
+ Hits          5501     5502       +1     
- Misses        2456     2458       +2     
+ Partials       360      359       -1     

Impacted Files	Coverage Δ
pkg/protocol/http1/req/request.go	61.88% <100.00%> (+1.88%)	⬆️
pkg/common/timer/timer.go	61.90% <0.00%> (-19.05%)	⬇️

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