feat: separate schema layer from decoder

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.20930% with 11 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (master-v2@6ffc019). Click here to learn what that means.

❗ Current head bb5fde4 differs from pull request most recent head 07c0856. Consider uploading reports for the commit 07c0856 to get more accurate results

Files	Patch %	Lines
internal/converter/schema/schema.go	91.43%	4 Missing and 2 partials ⚠️
internal/topo/node/decode_op.go	55.56%	0 Missing and 4 partials ⚠️
internal/converter/json/converter.go	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master-v2    #2815   +/-   ##
============================================
  Coverage             ?   65.54%           
============================================
  Files                ?      275           
  Lines                ?    30081           
  Branches             ?        0           
============================================
  Hits                 ?    19715           
  Misses               ?     8782           
  Partials             ?     1584           

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