feat: render support IndentedJSON

[li-jin-gou]

What type of PR is this?

feat

Check the PR title.

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

(Optional) Translate the PR title into Chinese.

render 支持 IndentedJSON

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

en: add JSONP and IndentedJSON zh: render 支持 IndentedJSON

Which issue(s) this PR fixes:

[welkeyever]

PR中文翻译也补充下哈

[codecov[bot]]

Codecov Report

Base: 61.57% // Head: 64.62% // Increases project coverage by +3.05% :tada:

Coverage data is based on head (ea3a5d8) compared to base (202fe6a). Patch coverage: 64.63% of modified lines in pull request are covered.

:exclamation: Current head ea3a5d8 differs from pull request most recent head da2d551. Consider uploading reports for the commit da2d551 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #289      +/-   ##
===========================================
+ Coverage    61.57%   64.62%   +3.05%     
===========================================
  Files           84       84              
  Lines         8288     8325      +37     
===========================================
+ Hits          5103     5380     +277     
+ Misses        2831     2583     -248     
- Partials       354      362       +8     

Impacted Files	Coverage Δ
pkg/app/client/loadbalance/lbcache.go	79.45% <0.00%> (ø)
pkg/app/client/loadbalance/weight_random.go	88.09% <0.00%> (ø)
pkg/network/netpoll/transport.go	0.00% <0.00%> (ø)
pkg/network/standard/transport.go	0.00% <0.00%> (ø)
pkg/protocol/http1/client.go	35.86% <0.00%> (ø)
pkg/app/fs.go	68.65% <10.00%> (ø)
pkg/route/engine.go	62.06% <11.11%> (ø)
pkg/app/server/render/html.go	37.50% <77.77%> (ø)
pkg/app/server/hertz.go	75.00% <80.00%> (ø)
pkg/app/server/render/json.go	71.42% <93.10%> (+23.28%)	:arrow_up:
... and 13 more

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