Use a more typesafe approach for managing indexed data (#6150)

* Fix for issue #2403

* Nightly fmt

* Quick documentation fixes

* Default Implementation

* iter() function integrated

* Implemented iter functionalities

* Fmt

* small change

* updates node-network

* updates in dispute-coordinator

* Updates

* benchmarking fix

* minor fix

* test fixes in runtime api

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Removal of [index], shorting of FromIterator, Renaming of GroupValidators to ValidatorGroups

* Removal of ops import

* documentation fixes for spell check

* implementation of generic type

* Refactoring

* Test and documentation fixes

* minor test fix

* minor test fix

* minor test fix

* Update node/network/statement-distribution/src/lib.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* removed IterMut

* Update node/core/dispute-coordinator/src/import.rs

Co-authored-by: Andronik <write@reusable.software>

* Update node/core/dispute-coordinator/src/initialized.rs

Co-authored-by: Andronik <write@reusable.software>

* Update primitives/src/v2/mod.rs

Co-authored-by: Andronik <write@reusable.software>

* fmt

* IterMut

* documentation update

Co-authored-by: Andronik <write@reusable.software>

* minor adjustments and new TypeIndex trait

* spelling fix

* TypeIndex fix

Co-authored-by: Andronik <write@reusable.software>

polkadot/node/subsystem-util/src/rolling_session_window.rs

@@ -399,10 +399,10 @@ mod tests {
 
 	fn dummy_session_info(index: SessionIndex) -> SessionInfo {
 		SessionInfo {
-			validators: Vec::new(),
+			validators: Default::default(),
 			discovery_keys: Vec::new(),
 			assignment_keys: Vec::new(),
-			validator_groups: Vec::new(),
+			validator_groups: Default::default(),
 			n_cores: index as _,
 			zeroth_delay_tranche_width: index as _,
 			relay_vrf_modulo_samples: index as _,