feat(gen): handle anyOf which can be represent by type sum

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #152 (e593f56) into main (eb5784c) will increase coverage by 1.37%.
The diff coverage is 92.17%.

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   72.38%   73.75%   +1.37%     
==========================================
  Files          78       80       +2     
  Lines        4838     5182     +344     
==========================================
+ Hits         3502     3822     +320     
- Misses       1110     1128      +18     
- Partials      226      232       +6     

Impacted Files	Coverage Δ
gen/schema_gen_sum.go	91.23% <91.23%> (ø)
gen/schema_gen_primitive.go	91.95% <91.95%> (ø)
internal/ir/validation.go	92.00% <92.10%> (+0.06%)	⬆️
gen/write.go	82.35% <100.00%> (+0.93%)	⬆️
internal/oas/parser/schema_parser.go	75.89% <100.00%> (+1.76%)	⬆️
gen/reduce.go	58.97% <0.00%> (+1.53%)	⬆️

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