Versioning for #[runtime-interface] (#5328)

* versionned runtime-interface

* use only one additional wasm blob

* alter docs

* formatting, naming and docs

* add comment for test

* version duplicate err

* RuntimeInterfaceItem -> RuntimeInterfaceFunction<

* test naming

* version checking

* remove spaces

* Update primitives/runtime-interface/proc-macro/src/runtime_interface/bare_function_interface.rs

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* remove sanity checks and reduce coverage

* add doc comment

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/primitives/runtime-interface/test-wasm-deprecated/src/lib.rs

@@ -0,0 +1,52 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tests for the runtime interface traits and proc macros.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use sp_core::wasm_export_functions;
+use sp_runtime_interface::runtime_interface;
+
+// Include the WASM binary
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+/// This function is not used, but we require it for the compiler to include `sp-io`.
+/// `sp-io` is required for its panic and oom handler.
+#[no_mangle]
+pub fn import_sp_io() {
+	sp_io::misc::print_utf8(&[]);
+}
+
+#[runtime_interface]
+pub trait TestApi {
+	fn test_versionning(&self, _data: u32) -> bool {
+		// should not be called
+		unimplemented!()
+	}
+}
+
+wasm_export_functions! {
+	fn test_versionning_works() {
+		// old api allows only 42 and 50
+		assert!(test_api::test_versionning(42));
+		assert!(test_api::test_versionning(50));
+
+		assert!(!test_api::test_versionning(142));
+		assert!(!test_api::test_versionning(0));
+	}
+}