[REQ][ASPNETCORE]Allow multiple naming conventions

Description

The swagger spec (OAS 3.0) that I use to generate my .NET Core server stubs contains many instances of variable names or attributes with hyphens and/or underscores, e.g., "X-Correlation-Id", "access_token", etc... C# does not allow hyphens in variable names, of course, and so the generator resolves these names to camelCase. This is a problem for me when I use NSwag to generate my client code and the names are, more accurately, resolved to snake_case. As a workaround, I have made a script to be run post-generation which replaces the names to be formatted how I want them.

openapi-generator version

3.3.4

OpenAPI declaration file content or url

Command line used for generation

java -jar .\modules\openapi-generator-cli\target\openapi-generator-cli.jar generate -i " + $jsonFile + " -g aspnetcore -o " + $OutputDir + " -c " + $configFile + " `-t " + $templates

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

I think allowing for multiple naming conventions in the c# generators could be a great improvement for the sake of flexibility in code generation.

Start with the aspnetcore C# generator invoked by the provided openapi-generator CLI command and trace how names such as X-Correlation-Id and access_token are resolved. Reproduce the behavior with an OpenAPI 3.0 declaration, then define and verify how multiple naming conventions should be selected for generated server stubs.