feat(gen): add string integers support

[tdakkota]

Fixes #309

[codecov]

Codecov Report

Merging #313 (9fb3d29) into main (6916daf) will increase coverage by 0.34%.
The diff coverage is 94.36%.

@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
+ Coverage   67.42%   67.77%   +0.34%     
==========================================
  Files         117      118       +1     
  Lines        7887     7953      +66     
==========================================
+ Hits         5318     5390      +72     
+ Misses       2228     2224       -4     
+ Partials      341      339       -2     

Impacted Files	Coverage Δ
gen/schema_gen_sum.go	83.53% <0.00%> (ø)
gen/ir/json.go	83.25% <72.72%> (-0.83%)	⬇️
gen/ir/type.go	78.12% <100.00%> (+1.45%)	⬆️
gen/schema_gen_primitive.go	88.61% <100.00%> (+0.38%)	⬆️
json/int.go	100.00% <100.00%> (ø)
jsonschema/parser.go	81.84% <0.00%> (+1.91%)	⬆️
openapi/parser/parse_components.go	100.00% <0.00%> (+8.10%)	⬆️

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