Function to_csharp_name 

pub fn to_csharp_name(name: &str) -> String

Convert a Rust snake_case name to C# PascalCase convention with initialism uppercasing.

Converts snake_case to PascalCase via heck and then restores known initialisms so that e.g. graphql_route_config → GraphQLRouteConfig (not GraphqlRouteConfig) and http_status → HTTPStatus (not HttpStatus).