[gen] Endpoint path modification in EndpointGen when having - in the path.

[wi101]

Describe the bug

When generating Scala endpoints from an OpenAPI JSON file using EndpointGen, any path segments containing - are automatically replaced with _. This behavior alters the expected endpoint paths and may lead to discrepancies between the OpenAPI specification and the generated code.

To Reproduce Steps to reproduce the behaviour:

1. Define an example api.json with an endpoint that contains -

   {
   "paths": {
   "/example-path": {
     "get": {
       "summary": "Example endpoint",
       ...
     }
   }
   }
   }

2. Generate scala code and the endpoints from api.json file.

   for {
     json                        <- readJsonFileAsString("/api.json")
     openApi                     <- ZIO.fromEither(OpenAPI.fromJson(json))
     endpointsAndComponentsFiles <- ZIO.attempt(EndpointGen.fromOpenAPI(openApi))
     directory                   <- ZIO.attempt(Files.createDirectories(Paths.get("src")))
     _                           <- ZIO
                                      .attempt(
                                        CodeGen.writeFiles(
                                          endpointsAndComponentsFiles,
                                          java.nio.file.Paths.get(directory.toString, "main", "scala", "codegen"),
                                          "codegen",
                                         None
                                        )
                                      )
   } yield ()

3. Observe that the generated endpoint path becomes /example_path.

   val post = Endpoint(Method.POST / "example_path")
   .in[Types]
   .out[Unit](status = Status.Ok)

Expected behaviour The generated endpoint should retain the original - character in the path as defined in the OpenAPI JSON file

Used version zio-http version: 3.0.1