fix: generate type with field type ast ref

[g4s8]

Reproduce and fix type filter issue.

Fix: #13

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 93.73%. Comparing base (19e804d) to head (7b40d73).

Files	Patch %	Lines
nodekind_string.go	0.00%	5 Missing ⚠️
inspector.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   94.45%   93.73%   -0.73%     
==========================================
  Files           8        9       +1     
  Lines         649      654       +5     
==========================================
  Hits          613      613              
- Misses         29       34       +5     
  Partials        7        7              

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