Implement generic bounds translation into Go

[AndyTitu]

📰 Overview

Since PR: #221, typeshare correctly translates struct generics in Go.
The following Rust snippet:

#[typeshare]
pub(crate) struct ItemsGetAllResponse {
    pub(crate) individual_responses: Vec<Response<Item, Error>>,
}

#[typeshare]
pub(crate) struct Response<T, E> {
    pub(crate) content: Option<T>,
    pub(crate) error: Option<E>,
}

Correctly translates to:

type Response[T any, E any] struct {
	Content *T `json:"content,omitempty"`
	Error *E `json:"error,omitempty"`
}

type ItemsGetAllResponse struct {
	IndividualResponses []IndividualResponse[Item, Error] `json:"individualResponses"`
}

However, generic bounds aren't supported:

#[typeshare]
pub(crate) struct IndividualResponse<T: Item, E: Error> {
    pub(crate) content: Option<T>,
    pub(crate) error: Option<E>,
}

doesn't translate to

type Response[T Item, E Error] struct {
	Content *T `json:"content,omitempty"`
	Error *E `json:"error,omitempty"`
}