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/// generates the sync version of the function if given the async version of the function.
/// it will tranverse the function and remove the async keyword and the .await keyword.
/// and also add the blocking feature to the function.
/// # Example
/// ```
/// cfg_gen_blocking! {
/// async fn hello() -> String {
/// "hello".to_string()
/// }
///
/// async fn send_request() -> String {
/// let response = reqwest::get("https://www.google.com").await.unwrap();
/// response.text().await.unwrap()
/// }
/// }
///
/// // will generate this code
///
///
/// #[cfg(any(target_arch = "wasm32", not(feature = "blocking")))]
/// async fn hello() -> String {
/// "hello".to_string()
/// }
///
/// #[cfg(all(not(target_arch = "wasm32"), feature = "blocking"))]
/// fn hello() -> String {
/// "hello".to_string()
/// }
///
/// #[cfg(any(target_arch = "wasm32", not(feature = "blocking")))]
/// async fn send_request() -> String {
/// let response = reqwest::get("https://www.google.com").await.unwrap();
/// response.text().await.unwrap()
/// }
/// #[cfg(all(not(target_arch = "wasm32"), feature = "blocking"))]
/// fn send_request() -> String {
/// let response = reqwest::blocking::get("https://www.google.com").unwrap();
/// response.text().unwrap()
/// }
///```
///
/// Adds the cfg "default" feature any item that is wrapped in this macro will be added to the
/// # Example
/// ```
/// cfg_non_blocking! {
/// async fn hello() -> String {
/// "hello".to_string()
/// }
/// }
///
/// // will generate this code
///
/// #[cfg(any(target_arch = "wasm32", not(feature = "blocking")))]
/// async fn hello() -> String {
/// "hello".to_string()
/// }
/// ```
/// adds the cfg "blocking" feature to any item that is wrapped in this macro.
/// # Example
/// ```
/// cfg_blocking! {
/// fn hello() -> String {
/// "hello".to_string()
/// }
///
/// static HELLO: String = "hello".to_string();
/// }
///
/// // will generate this code
///
/// #[cfg(all(not(target_arch = "wasm32"), feature = "blocking"))]
/// fn hello() -> String {
/// "hello".to_string()
/// }
///
/// #[cfg(all(not(target_arch = "wasm32"), feature = "blocking"))]
/// static HELLO: String = "hello".to_string();
///
/// ```
/// To test this expand the macro using rust analyzer's macro expansion feature while having the
/// cfg_gen_blocking! macro selected.