[BUG] `nameInCamelCase` generates property in `PascalCase`

Bug Report Checklist

Description

There is an attribute called nameInCamelCase in class CodegenProperty. For C# server side generation this results in a name in pascal case. This works for us because we were looking for pascal case anyway, but the name nameInCamelCase is at least misleading.

openapi-generator version

3.0.3

OpenAPI declaration file content or url

https://gist.github.com/jnnwnk/6ee8d7c2102725aa367fc2135648027a

Command line used for generation

java -jar .\openapi-generator-cli-3.0.3.jar generate -i .\openapi.json -g aspnetcore -c .\config.json -o .\output\ -t .\templatesNetCore\

Steps to reproduce

• Place model.mustache in folder templatesNetCore
• Execute command line
• See generated name of property in MySampleObject.cs

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/3827

Suggest a fix

There two options:

• Fix naming in code (call attribute nameInPascalCase instead of nameInCamelCase)
• Fix implementation, so when using nameInCamelCase the generated attribute / property will be using the correct case

Actually it would be nice to have the choice between the well known cases (camelCase, PascalCase, snake_case, SNAKE_CASE_ALL_CAPS, kebap-case). See link for examples. But this might be a feature request instead of a bug.

Start with modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java, especially the nameInCamelCase attribute, then inspect the referenced model.mustache used by the aspnetcore generator. Reproduce the generation command with the linked OpenAPI declaration and check MySampleObject.cs. Done means the naming attribute and generated property casing are no longer misleading or inconsistent.