feat(parser): add x-ogen-custom-security extension

[tdakkota]

No description provided.

[codecov]

Codecov Report

Patch coverage: 87.09% and project coverage change: +0.02% 🎉

Comparison is base (9d1e05a) 72.20% compared to head (4135e32) 72.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1058      +/-   ##
==========================================
+ Coverage   72.20%   72.22%   +0.02%     
==========================================
  Files         192      192              
  Lines       15027    15046      +19     
==========================================
+ Hits        10850    10867      +17     
- Misses       3641     3643       +2     
  Partials      536      536              

Files Changed	Coverage Δ
openapi/parser/parse_security.go	94.94% <82.60%> (-1.85%)	⬇️
gen/gen_security.go	80.71% <100.00%> (+0.86%)	⬆️
gen/ir/security.go	85.71% <100.00%> (+1.09%)	⬆️

... and 1 file with indirect coverage changes

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