gox dom: add outline api

[xushiwei]

No description provided.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e9b564a) 94.52% compared to head (27527b8) 94.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #264   +/-   ##
=======================================
  Coverage   94.52%   94.53%           
=======================================
  Files          14       14           
  Lines        6376     6386   +10     
=======================================
+ Hits         6027     6037   +10     
  Misses        281      281           
  Partials       68       68           

Files	Coverage Δ
ast.go	96.24% <100.00%> (ø)
builtin.go	94.43% <100.00%> (ø)
c.go	100.00% <100.00%> (ø)
codebuild.go	95.93% <100.00%> (ø)
func.go	97.76% <100.00%> (+0.08%)	⬆️
template.go	82.81% <100.00%> (ø)

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