feat:(ast) export some API for third-party JSON libs

[AsterDY]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.41176% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 77.57%. Comparing base (5d45952) to head (42491f9).

Files	Patch %	Lines
ast/search.go	66.66%	9 Missing and 4 partials ⚠️
unquote/unquote.go	53.84%	6 Missing ⚠️
ast/decode.go	90.00%	2 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #608      +/-   ##
==========================================
- Coverage   77.58%   77.57%   -0.01%     
==========================================
  Files          84       84              
  Lines       11538    11609      +71     
==========================================
+ Hits         8952     9006      +54     
- Misses       2188     2202      +14     
- Partials      398      401       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.