First draft of offchain phragmen weights (#6032)

* Fist draft of offchain weights

* Round of review feedback

* Update frame/staking/src/lib.rs

* Fix fuzzer

* Remove some redundant comment

* Weight refund for submit solution -- potentially revert.

* First version with custom trimming of the result.

* Update frame/staking/src/benchmarking.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update frame/staking/src/benchmarking.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Apply suggestions from code review

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

* Update frame/staking/src/benchmarking.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update frame/staking/src/benchmarking.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Some improvements

* Benchmark submit solution without phragmen (PR for First draft of offchain phragmen weights) (#6073)

* implementation of new benchmark

* address comments

* replace test

* Update frame/staking/src/lib.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* update weight

* Fix refund

* Clean and rady for final bench

* Fix line-wdith

* Fix gitlab build

* Fix line-wdith

* Fix test macro

* Update frame/staking/src/lib.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update frame/staking/src/benchmarking.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Better length check

* Update frame/staking/src/lib.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update final weight coefficients

* Update frame/staking/src/lib.rs

* Apply suggestions from code review

* Update frame/staking/src/testing_utils.rs

* Try and fix the line-width

* Revert "Try and fix the line-width"

This reverts commit b4e284727220085b9b3daf7682c4bbf29621da09.

* Try and fix the line-width the correct way

* Revert "Try and fix the line-width the correct way"

This reverts commit 04fce128e851c9584f9f0d708a5a73cae799d8c8.

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Gavin Wood <gavin@parity.io>

substrate/utils/frame/benchmarking-cli/src/command.rs

@@ -27,7 +27,12 @@ use sc_service::{Configuration, NativeExecutionDispatch};
 use sp_runtime::{
 	traits::{Block as BlockT, Header as HeaderT, NumberFor},
 };
-use sp_core::{tasks, testing::KeyStore, traits::KeystoreExt};
+use sp_core::{
+	tasks,
+	testing::KeyStore,
+	traits::KeystoreExt,
+	offchain::{OffchainExt, testing::TestOffchainExt},
+};
 use std::fmt::Debug;
 
 impl BenchmarkCmd {
@@ -56,6 +61,8 @@ impl BenchmarkCmd {
 
 		let mut extensions = Extensions::default();
 		extensions.register(KeystoreExt(KeyStore::new()));
+		let (offchain, _) = TestOffchainExt::new();
+		extensions.register(OffchainExt::new(offchain));
 
 		let result = StateMachine::<_, _, NumberFor<BB>, _>::new(
 			&state,