Per-transaction weight for srml (#2799)

* debug checkpoint.

* new

* Worked.

* Worked and weight propagated to executive.

* Works with some tests.

* Cleanup debug prints.

* More cleanup.

* Undo more logs.

* Undo a few more.

* Fix build.

* Allow len to be used in weight calculation.

* Remove noop function from dispath.

* Cleanup.

* Unify traits.

* Update docs and nits.

* line width

* Update core/sr-primitives/src/weights.rs

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

* Update core/sr-primitives/src/weights.rs

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

* Update core/sr-primitives/src/weights.rs

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

* Update core/sr-primitives/src/weights.rs

Co-Authored-By: Amar Singh <asinghchrony@protonmail.com>

* Update srml/example/src/lib.rs

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

* Final cleanup.

* Fix build.

substrate/node/runtime/src/lib.rs

@@ -58,7 +58,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
-	spec_version: 92,
+	spec_version: 93,
 	impl_version: 94,
 	apis: RUNTIME_API_VERSIONS,
 };