feat(oauth2): added support

[alesbrelih]

Hi!

Thanks for this generation, after quite a search it seems like this generator actually works! And it has nice golang syntax behind it.

Because the only limitation I have with this generation is the lack of oauth2 security provider I decided I wanted to contribute to this project.

I wanted to implement it as simple as possible.

Thanks!

[codecov]

Codecov Report

Patch coverage: 96.66% and project coverage change: -0.03% ⚠️

Comparison is base (660d20e) 72.20% compared to head (f22ad07) 72.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1025      +/-   ##
==========================================
- Coverage   72.20%   72.18%   -0.03%     
==========================================
  Files         192      192              
  Lines       14991    15015      +24     
==========================================
+ Hits        10825    10838      +13     
- Misses       3631     3641      +10     
- Partials      535      536       +1     

Files Changed	Coverage Δ
gen/gen_security.go	79.85% <96.29%> (-4.08%)	⬇️
gen/gen_operation.go	88.88% <100.00%> (ø)
gen/ir/security.go	84.61% <100.00%> (+1.28%)	⬆️

... and 1 file with indirect coverage changes

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[alesbrelih]

Forgot to run lint task, now it should be fixed.

[shadowspore]

@tdakkota ptal