feat: add Result<T> type alias for `std::result::Result<T, tonic::S…

…tatus>` (#1085)

* add `Result<T>` type alias for `std::result::Result<T, tonic::Status>`

* Allow user to override the error type

Co-authored-by: David Pedersen <david.pdrsn@gmail.com>

* add rustdoc for `tonic::Result`

* cargo fmt

Co-authored-by: David Pedersen <david.pdrsn@gmail.com>

tonic/src/lib.rs

@@ -122,3 +122,7 @@ pub(crate) type Error = Box<dyn std::error::Error + Send + Sync>;
 #[cfg(feature = "codegen")]
 #[cfg_attr(docsrs, doc(cfg(feature = "codegen")))]
 pub mod codegen;
+
+/// `Result` is a type that represents either success ([`Ok`]) or failure ([`Err`]).
+/// By default, the Err value is of type [`Status`] but this can be overridden if desired.
+pub type Result<T, E = Status> = std::result::Result<T, E>;