Additional state check. (#2915)

* check resulting state root on import.

* get root from last method.

* Fix test runtime (was changing state after root calculation).

* Do reset new authorities (just take before root calculation).

* bump impl runtime version.

* Update core/sr-api-macros/tests/trybuild.rs

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

substrate/core/client/src/error.rs

@@ -94,6 +94,9 @@ pub enum Error {
 	/// Hash that is required for building CHT is missing.
 	#[display(fmt = "Failed to get hash of block for building CHT")]
 	MissingHashRequiredForCHT,
+	/// Invalid calculated state root on block import.
+	#[display(fmt = "Calculated state root does not match.")]
+	InvalidStateRoot,
 	/// A convenience variant for String
 	#[display(fmt = "{}", _0)]
 	Msg(String),