Preimage registrar and Scheduler integration (#10356)

* initial idea

* more

* fix compile

* add clear and request logic

* improve some docs

* Add and implement trait

* continuing to improve

* refcount type

* infallible system preimage upload

* fmt

* fix requests

* Make it simple

* Make it simple

* Formatting

* Initial draft

* request when scheduled

* Docs

* Scheduler good

* Scheduler good

* Scheduler tests working

* Add new files

* Missing stuff

* Repotting, add weights.

* Add some tests to preimage pallet

* More tests

* Fix benchmarks

* preimage benchmarks

* All preimage benchmarks

* Tidy cargo

* Update weights.rs

* Allow hash provision in benchmarks

* Initial work on new benchmarks for Scheduler

* Tests working, refactor looks good

* Tests for new Scheduler functionality

* Use real weight, make tests work with runtimes without Preimage

* Rename

* Update benchmarks

* Formatting

* Formatting

* Fix weird formatting

* Update frame/preimage/src/lib.rs

* Fix try-runtime build

* Fixes

* Fixes

* Update frame/support/src/traits/tokens/currency.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update frame/support/src/traits/tokens/currency/reservable.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update frame/support/src/traits/tokens/imbalance.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update frame/preimage/src/mock.rs

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

* Update frame/scheduler/src/lib.rs

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

* Update frame/preimage/src/lib.rs

* Fixes

* Fixes

* Formatting

* Fixes

* Fixes

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_scheduler --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/scheduler/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_preimage --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/preimage/src/weights.rs --template=./.maintain/frame-weight-template.hbs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Parity Bot <admin@parity.io>

substrate/frame/system/src/lib.rs

@@ -344,7 +344,7 @@ pub mod pallet {
 		/// # </weight>
 		#[pallet::weight(T::SystemWeightInfo::remark(_remark.len() as u32))]
 		pub fn remark(origin: OriginFor<T>, _remark: Vec<u8>) -> DispatchResultWithPostInfo {
-			ensure_signed(origin)?;
+			ensure_signed_or_root(origin)?;
 			Ok(().into())
 		}
 
@@ -872,6 +872,22 @@ where
 	}
 }
 
+/// Ensure that the origin `o` represents either a signed extrinsic (i.e. transaction) or the root.
+/// Returns `Ok` with the account that signed the extrinsic, `None` if it was root,  or an `Err`
+/// otherwise.
+pub fn ensure_signed_or_root<OuterOrigin, AccountId>(
+	o: OuterOrigin,
+) -> Result<Option<AccountId>, BadOrigin>
+where
+	OuterOrigin: Into<Result<RawOrigin<AccountId>, OuterOrigin>>,
+{
+	match o.into() {
+		Ok(RawOrigin::Root) => Ok(None),
+		Ok(RawOrigin::Signed(t)) => Ok(Some(t)),
+		_ => Err(BadOrigin),
+	}
+}
+
 /// Ensure that the origin `o` represents the root. Returns `Ok` or an `Err` otherwise.
 pub fn ensure_root<OuterOrigin, AccountId>(o: OuterOrigin) -> Result<(), BadOrigin>
 where