Transaction versioning in the RuntimeVersion (#5582)

* Add transaction_version

* Semantic versioning for runtimes

* Move new field to bottom

* Versioning

* Runtime versioning stuff.

* Fix test

* Adds tests and fixes bugs

* Bump runtime

Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/primitives/sr-api/proc-macro/src/lib.rs

@@ -103,6 +103,7 @@ mod utils;
 ///     impl_version: 0,
 ///     // Here we are exposing the runtime api versions.
 ///     apis: RUNTIME_API_VERSIONS,
+///     transaction_version: 1,
 /// };
 ///
 /// # fn main() {}