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/src/lib.rs

@@ -22,12 +22,19 @@
 #![warn(missing_docs)]
 #![deny(warnings)]
 
+#[cfg(test)]
+mod pallet_version;
+
 /// The configuration trait
-pub trait Trait {
+pub trait Trait: 'static {
 	/// The runtime origin type.
-	type Origin;
+	type Origin: codec::Codec + codec::EncodeLike + Default;
 	/// The block number type.
-	type BlockNumber;
+	type BlockNumber: codec::Codec + codec::EncodeLike + Default;
+	/// The information about the pallet setup in the runtime.
+	type PalletInfo: frame_support::traits::PalletInfo;
+	/// The db weights.
+	type DbWeight: frame_support::traits::Get<frame_support::weights::RuntimeDbWeight>;
 }
 
 frame_support::decl_module! {