[Feature]: Support custom json codec at runtime

[timandy]

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Extract out an interface json.Core to define all serialization and deserialization behaviors.

Developers only need to implement the interface and set the value of json.API to custom json codec.

In the future, we can define xml.Core in the same way.

Solved #3217

[timandy]

@appleboy Please take a look, thanks~

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.19%. Comparing base (3dc1cd6) to head (2118c7c). Report is 63 commits behind head on master.

:exclamation: Current head 2118c7c differs from pull request most recent head eeaa150

Please upload reports for the commit eeaa150 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3391      +/-   ##
==========================================
- Coverage   99.21%   99.19%   -0.03%     
==========================================
  Files          42       43       +1     
  Lines        3182     2722     -460     
==========================================
- Hits         3157     2700     -457     
+ Misses         17       12       -5     
- Partials        8       10       +2     

Flag	Coverage Δ
	?
-tags "sonic avx"	99.18% <100.00%> (?)
-tags go_json	99.18% <100.00%> (?)
-tags nomsgpack	99.17% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	99.19% <100.00%> (-0.03%)	:arrow_down:
go-1.22	99.19% <100.00%> (?)
macos-latest	99.19% <100.00%> (-0.03%)	:arrow_down:
ubuntu-latest	99.19% <100.00%> (-0.03%)	:arrow_down:

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[aohanhongzhi]

good job! I need the feature.

[appleboy]

@timandy We move to the next milestone v1.11

[fifsky]

I recommend removing all third-party JSON packages after defining the JsonApi to reduce dependencies. Related discussion: https://github.com/gin-gonic/gin/issues/3653#issuecomment-1614022681

We should not piling json libraries

[devhaozi]

I recommend removing all third-party JSON packages after defining the JsonApi to reduce dependencies. Related discussion: #3653 (comment)

We should not piling json libraries

Agree with this, I don't want to see four different json implementations in one web framework.

[appleboy]

@timandy Can you create a new PR? I can't handle this PR (maybe no permission to trigger CI testing)

[timandy]

@appleboy All right, I will rebase on the latest commit.

[appleboy]

@timandy Thanks.

[timandy]

@aohanhongzhi I have rebased it, Please tabke a look.

[appleboy]

related: https://github.com/gin-gonic/gin/issues/3766