optimize: public ErrNoMultipartForm

[li-jin-gou]

What type of PR is this?

optimize

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.
• Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo.

(Optional) Translate the PR title into Chinese.

• 公开 ErrNoMultipartForm

(Optional) Which issue(s) this PR fixes:

(Optional) The PR that updates user documentation:

[codecov]

Codecov Report

Patch coverage: 75.00% and project coverage change: -0.08 ⚠️

Comparison is base (62aa1a0) 75.66% compared to head (454fe1b) 75.59%.

❗ Current head 454fe1b differs from pull request most recent head d8b992d. Consider uploading reports for the commit d8b992d to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #785      +/-   ##
===========================================
- Coverage    75.66%   75.59%   -0.08%     
===========================================
  Files           97       97              
  Lines         9477     9477              
===========================================
- Hits          7171     7164       -7     
- Misses        1856     1862       +6     
- Partials       450      451       +1     

Impacted Files	Coverage Δ
pkg/app/server/hertz.go	73.21% <0.00%> (ø)
pkg/common/errors/errors.go	87.95% <ø> (ø)
pkg/common/stackless/writer.go	88.23% <ø> (ø)
pkg/common/tracer/stats/event.go	92.00% <ø> (ø)
pkg/common/test/mock/network.go	89.84% <100.00%> (ø)
pkg/protocol/request.go	83.85% <100.00%> (ø)

... and 1 file with indirect coverage changes

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