Complete PascalCase transformation for C# clients

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### Is your feature request related to a problem? Please describe the problem.

Hello,

I used Kiota to generate a C# api client out of a Django openapi specification. It unfortunately still generates quite some PascalCase/snake_case mixtures in naming.

Example specification:
`{
"openapi": "3.0.0",
"info": {
"title": "Sample Users API",
"description": "This API manages user information with more explicitly snake_case paths",
"version": "1.0.0"
},
"servers": [
{
"url": "https://api.sample.com/v1",
"description": "Primary production server"
}
],
"paths": {
"/users/user_details/{user_id}": {
"get": {
"summary": "Retrieve specific user details",
"description": "Fetches details of a specific user by user ID",
"operation_id": "get_specific_user_details",
"parameters": [
{
"name": "user_id",
"in": "path",
"required": true,
"description": "The unique identifier for the user",
"schema": {
"type": "integer"
}
}
],
"responses": {
"200": {
"description": "Successful response with user details",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"user_id": {
"type": "integer",
"description": "Unique identifier for the user"
},
"user_name": {
"type": "string",
"description": "The user's name"
}
}
}
}
}
}
}
}
},
"/users/{user_id}/update_role": {
"post": {
"summary": "Update a user's role",
"description": "Updates the role of a specific user by user ID",
"operation_id": "update_user_role",
"parameters": [
{
"name": "user_id",
"in": "path",
"required": true,
"description": "The unique identifier for the user",
"schema": {
"type": "integer"
}
}
],
"requestBody": {
"required": true,
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"new_role": {
"type": "string",
"enum": [
"admin_role",
"user_role",
"guest_role"
],
"description": "The new role of the user"
}
},
"required": [
"new_role"
]
}
}
}
},
"responses": {
"200": {
"description": "Role updated successfully"
},
"400": {
"description": "Invalid input provided"
}
}
}
}
}
}`

Folders & Classes in snake_case:

Namespaces:

Properties, inner classes:

Enums and enum-values:

Perhaps there are more scenarios. I tried to fix it myself but with the time I have the C# refiner class is too complicated to add changes to.

### Client library/SDK language

Csharp

### Describe the solution you'd like

It would be great to have the C# refiner Class extended with more snake_case to PascalCase renaming

### Additional context

_No response_

Start with the C# refiner class and generate a client from the supplied OpenAPI example to inventory the remaining snake_case names. Extend the refiner so folders, classes, namespaces, properties, inner classes, enums, and enum values consistently use PascalCase, then verify the generated output against these cases.

Written by the indexing model from the issue text.