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/support/test/tests/derive_impl_ui/inject_runtime_type_fails_when_type_not_in_scope.rs

@@ -0,0 +1,23 @@
+use frame_support::{*, pallet_prelude::inject_runtime_type};
+use static_assertions::assert_type_eq_all;
+
+pub trait Config {
+    type RuntimeCall;
+}
+
+struct Pallet;
+
+#[register_default_impl(Pallet)]
+impl Config for Pallet {
+    #[inject_runtime_type]
+    type RuntimeCall = ();
+}
+
+struct SomePallet;
+
+#[derive_impl(Pallet)] // Injects type RuntimeCall = RuntimeCall;
+impl Config for SomePallet {}
+
+assert_type_eq_all!(<SomePallet as Config>::RuntimeCall, u32);
+
+fn main() {}

substrate/frame/support/test/tests/derive_impl_ui/inject_runtime_type_fails_when_type_not_in_scope.stderr

@@ -0,0 +1,10 @@
+error[E0412]: cannot find type `RuntimeCall` in this scope
+  --> tests/derive_impl_ui/inject_runtime_type_fails_when_type_not_in_scope.rs:13:10
+   |
+13 |     type RuntimeCall = ();
+   |          ^^^^^^^^^^^ help: you might have meant to use the associated type: `Self::RuntimeCall`
+...
+18 | #[derive_impl(Pallet)] // Injects type RuntimeCall = RuntimeCall;
+   | ---------------------- in this macro invocation
+   |
+   = note: this error originates in the macro `__export_tokens_tt_pallet` which comes from the expansion of the macro `frame_support::macro_magic::forward_tokens` (in Nightly builds, run with -Z macro-backtrace for more info)

substrate/frame/support/test/tests/derive_impl_ui/inject_runtime_type_invalid.rs

@@ -0,0 +1,25 @@
+use frame_support::{*, pallet_prelude::inject_runtime_type};
+use static_assertions::assert_type_eq_all;
+
+pub trait Config {
+    type RuntimeInfo;
+}
+
+type RuntimeInfo = u32;
+
+struct Pallet;
+
+#[register_default_impl(Pallet)]
+impl Config for Pallet {
+    #[inject_runtime_type]
+    type RuntimeInfo = ();
+}
+
+struct SomePallet;
+
+#[derive_impl(Pallet)] // Injects type RuntimeInfo = RuntimeInfo;
+impl Config for SomePallet {}
+
+assert_type_eq_all!(<SomePallet as Config>::RuntimeInfo, u32);
+
+fn main() {}

substrate/frame/support/test/tests/derive_impl_ui/inject_runtime_type_invalid.stderr

@@ -0,0 +1,14 @@
+error: `#[inject_runtime_type]` can only be attached to `RuntimeCall`, `RuntimeEvent`, `RuntimeOrigin` or `PalletInfo`
+  --> tests/derive_impl_ui/inject_runtime_type_invalid.rs:15:5
+   |
+15 |     type RuntimeInfo = ();
+   |     ^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0046]: not all trait items implemented, missing: `RuntimeInfo`
+  --> tests/derive_impl_ui/inject_runtime_type_invalid.rs:13:1
+   |
+5  |     type RuntimeInfo;
+   |     ---------------- `RuntimeInfo` from trait
+...
+13 | impl Config for Pallet {
+   | ^^^^^^^^^^^^^^^^^^^^^^ missing `RuntimeInfo` in implementation

substrate/frame/support/test/tests/derive_impl_ui/pass/runtime_type_working.rs

@@ -0,0 +1,25 @@
+use frame_support::{*, pallet_prelude::inject_runtime_type};
+use static_assertions::assert_type_eq_all;
+
+pub trait Config {
+    type RuntimeCall;
+}
+
+type RuntimeCall = u32;
+
+struct Pallet;
+
+#[register_default_impl(Pallet)]
+impl Config for Pallet {
+    #[inject_runtime_type]
+    type RuntimeCall = ();
+}
+
+struct SomePallet;
+
+#[derive_impl(Pallet)] // Injects type RuntimeCall = RuntimeCall;
+impl Config for SomePallet {}
+
+assert_type_eq_all!(<SomePallet as Config>::RuntimeCall, u32);
+
+fn main() {}