Moving NposSolution to frame (#11031)

* Move `sp-npos-elections-solution-type`
to `frame-election-provider-support`
First stab at it, will need to amend some more stuff

* Fixing tests

* Fixing tests

* Fixing cargo.toml for std configuration

* fmt

* Committing suggested changes
renaming, and re exporting macro.

* Removing unneeded imports

* Move `NposSolution` to frame

* Removing `npos_election` dependencies
Implementing _fpes better

* some feedback for moving NPoSSolution to frame

* fmt

* more formatting

* Fixed some imports and fmt

* Fixing docs

Co-authored-by: kianenigma <kian@parity.io>

substrate/frame/election-provider-multi-phase/src/mock.rs

@@ -18,7 +18,7 @@
 use super::*;
 use crate as multi_phase;
 use frame_election_provider_support::{
-	data_provider, onchain, ElectionDataProvider, SequentialPhragmen,
+	data_provider, onchain, ElectionDataProvider, NposSolution, SequentialPhragmen,
 };
 pub use frame_support::{assert_noop, assert_ok};
 use frame_support::{
@@ -38,7 +38,7 @@ use sp_core::{
 };
 use sp_npos_elections::{
 	assignment_ratio_to_staked_normalized, seq_phragmen, to_supports, ElectionResult,
-	EvaluateSupport, ExtendedBalance, NposSolution,
+	EvaluateSupport, ExtendedBalance,
 };
 use sp_runtime::{
 	testing::Header,