Function grin_api::client::post

pub fn post<IN, OUT>(
    url: &str, 
    api_secret: Option<String>, 
    input: &IN
) -> Result<OUT, Error> where
    IN: Serialize,
    OUT: Deserialize<'de>, 

Helper function to easily issue a HTTP POST request with the provided JSON object as body on a given URL that returns a JSON object. Handles request building, JSON serialization and deserialization, and response code checking.