Emit semantic tokens for user defined conversions

Feature Request

User defined conversions are the only operator overloads that aren't able to be syntax colored to make them more obvious (aside from new and delete, which I reported recently).

I'd like to request semantic tokens to enable syntax highlighting when a user defined conversion is invoked.

The tricky bit is, which token should it be? On the parentheses? Sometimes there aren't any parenthesis.

Perhaps it should be a modifier on the variable being converted? Can we do that if it's an entire expression? Maybe then we could underline the expression without changing the color of the entire thing.

It would also be nice if "go to definition" worked for the conversion, like other operator overloads. But I don't know if that's feasible.

Comienza revisando cómo la extensión emite actualmente semantic tokens y admite go-to-definition para otras sobrecargas de operadores de C++. Compara los ejemplos de conversión reportados, incluidos los casos sin paréntesis, y determina una representación de token que pueda aplicarse de forma coherente. Se considerará terminado cuando el comportamiento, la elección del token y cualquier compatibilidad con la navegación a la definición estén especificados y cubiertos para las formas de conversión relevantes.