Implements pallet versioning (#7208)

* Start

* Make macro work

* Rename `ModuleToIndex` to `PalletRuntimeSetup`

Besides the renaming it also adds support getting the name of a pallet
as configured in the runtime.

* Rename it to `PalletInfo`

* Remove accidentally added files

* Some work

* Make everything compile

* Adds a test and fixes some bugs

* Implement ordering for `PalletVersion`

* Apply suggestions from code review

* Review feedback

* Update frame/support/src/dispatch.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Update frame/support/src/dispatch.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Fix compilation

* Fix test

* Fix doc test

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

substrate/frame/support/test/tests/construct_runtime.rs

@@ -129,6 +129,7 @@ impl system::Trait for Runtime {
 	type Event = Event;
 	type PalletInfo = PalletInfo;
 	type Call = Call;
+	type DbWeight = ();
 }
 
 frame_support::construct_runtime!(