Adds ability to provide defaults for types provided by construct_runtime (#14682)

* Adds ability to use defaults for verbatim types

* Adds RuntimeOrigin and PalletInfo in DefaultConfig

* Adds RuntimeEvent in DefaultConfig

* Adds RuntimeEvent in DefaultConfig

* Minor fix

* Minor fix

* Everything in frame_system can now have a default

* Adds docs

* Adds UI Test for no_bounds

* Updates docs

* Adds UI tests for verbatim

* Minor update

* Minor updates

* Minor updates

* Addresses review comments

* Fixes test

* Update frame/support/procedural/src/derive_impl.rs

Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

* Minor fix

* Minor

* Fixes build

* Uses runtime_type

* Fixes comment

* Fixes comment

* Fixes test

* Uses no_aggregated_types as an option in derive_impl

* Uses specific imports

* Fmt

* Updates doc

* Update frame/support/procedural/src/derive_impl.rs

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

* Update frame/support/procedural/src/derive_impl.rs

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

* Addresses review comment

* Addresses review comment

* fmt

* Renames test files

* Adds docs using docify

* Fixes test

* Fixes UI tests

---------

Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>
Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/frame/examples/default-config/src/lib.rs

@@ -87,7 +87,7 @@ pub mod pallet {
 		/// A type providing default configurations for this pallet in testing environment.
 		pub struct TestDefaultConfig;
 
-		#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
+		#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig, no_aggregated_types)]
 		impl frame_system::DefaultConfig for TestDefaultConfig {}
 
 		#[frame_support::register_default_impl(TestDefaultConfig)]
@@ -109,7 +109,7 @@ pub mod pallet {
 		/// example, we simple derive `frame_system::config_preludes::TestDefaultConfig` again.
 		pub struct OtherDefaultConfig;
 
-		#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
+		#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig, no_aggregated_types)]
 		impl frame_system::DefaultConfig for OtherDefaultConfig {}
 
 		#[frame_support::register_default_impl(OtherDefaultConfig)]
@@ -147,16 +147,7 @@ pub mod tests {
 	#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 	impl frame_system::Config for Runtime {
 		// these items are defined by frame-system as `no_default`, so we must specify them here.
-		// Note that these are types that actually rely on the outer runtime, and can't sensibly
-		// have an _independent_ default.
 		type Block = Block;
-		type BlockHashCount = frame_support::traits::ConstU64<10>;
-		type BaseCallFilter = frame_support::traits::Everything;
-		type RuntimeOrigin = RuntimeOrigin;
-		type RuntimeCall = RuntimeCall;
-		type RuntimeEvent = RuntimeEvent;
-		type PalletInfo = PalletInfo;
-		type OnSetCode = ();
 
 		// all of this is coming from `frame_system::config_preludes::TestDefaultConfig`.
 
@@ -177,6 +168,17 @@ pub mod tests {
 		// type BlockWeights = ();
 		// type BlockLength = ();
 		// type DbWeight = ();
+		// type BaseCallFilter = frame_support::traits::Everything;
+		// type BlockHashCount = frame_support::traits::ConstU64<10>;
+		// type OnSetCode = ();
+
+		// These are marked as `#[inject_runtime_type]`. Hence, they are being injected as
+		// types generated by `construct_runtime`.
+
+		// type RuntimeOrigin = RuntimeOrigin;
+		// type RuntimeCall = RuntimeCall;
+		// type RuntimeEvent = RuntimeEvent;
+		// type PalletInfo = PalletInfo;
 
 		// you could still overwrite any of them if desired.
 		type SS58Prefix = frame_support::traits::ConstU16<456>;