feat: support decode schemaless schema

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: 49 lines in your changes are missing coverage. Please review.

Comparison is base (30d390e) 62.59% compared to head (0ca758f) 62.56%.

❗ Current head 0ca758f differs from pull request most recent head 56209ac. Consider uploading reports for the commit 56209ac to get more accurate results

Files	Patch %	Lines
internal/converter/json/converter.go	64.23%	36 Missing and 13 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2487      +/-   ##
==========================================
- Coverage   62.59%   62.56%   -0.03%     
==========================================
  Files         308      308              
  Lines       36482    36275     -207     
==========================================
- Hits        22833    22694     -139     
+ Misses      11535    11469      -66     
+ Partials     2114     2112       -2     

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