Serialize OperationNameGenerator enum as string

[christianhelle]

This pull request adds the [JsonConverter(typeof(JsonStringEnumConverter))] attribute to the OperationNameGenerator property in the RefitGeneratorSettings class.

Additionally, it sets the operationNameGenerator property to Default in the petstore.refitter file.

This resolves #277

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8736905) 97.46% compared to head (fa498ac) 97.46%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #278   +/-   ##
=======================================
  Coverage   97.46%   97.46%           
=======================================
  Files          60       60           
  Lines        2131     2131           
=======================================
  Hits         2077     2077           
  Misses         37       37           
  Partials       17       17           

Flag	Coverage Δ
unittests	97.46% <ø> (ø)

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