Code Generator creates unsafe interface method names

[dammitjanet]

Describe the bug
if the OpenAPI specification URL final part ("/api/manage/2fa") starts with a number, then the resulting method is invalid as the resulting method starts with that number

        [Headers("Accept: text/plain, application/json, text/json")]
        [Post("/api/manage/2fa")]
        Task<IApiResponse> 2faAsync([Body] TwoFactorRequest? body = default, CancellationToken cancellationToken = default);

in this case, Invalid token 2f

Support Key: 7l7irxz

OpenAPI Specifications

       "/api/manage/2fa": {
            "post": {
                "tags": [
                    "Manage"
                ],
                "requestBody": {
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/TwoFactorRequest"
                            }
                        }
                    }
                },
                "responses": {
                    "200": {
                        "description": "Success"
                    },
                    "400": {
                        "description": "Bad Request"
                    },
                    "404": {
                        "description": "Not Found",
                        "content": {
                            "text/plain": {
                                "schema": {
                                    "$ref": "#/components/schemas/ProblemDetails"
                                }
                            },
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/ProblemDetails"
                                }
                            },
                            "text/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/ProblemDetails"
                                }
                            }
                        }
                    }
                }
            }
        },

Additional context
The OpenAPI spec is a Swagger generated

[dammitjanet]

This is something that can be resolved with the same workaround noted #361

[christianhelle]

@Fargekritt resolved this in #562