Statement store (#13701)

* WIP Statement store

* Sync with networking changes in master

* WIP statement pallet

* Statement validation

* pallet tests

* Validation queue

* Store maintenance

* Basic statement refactoring + tests + docs

* Store metrics

* Store tests

* Store maintenance test

* cargo fmt

* Build fix

* OCW Api

* Offchain worker

* Enable host functions

* fmt

* Minor tweaks

* Fixed a warning

* Removed tracing

* Manual expiration

* Reworked constraint management

* Updated pallet constraint calculation

* Added small test

* Added remove function to the APIs

* Copy-paste spec into readme

* Comments

* Made the store optional

* Removed network protocol controller

* fmt

* Clippy fixes

* fmt

* fmt

* More clippy fixes

* More clippy fixes

* More clippy fixes

* Update client/statement-store/README.md

Co-authored-by: cheme <emericchevalier.pro@gmail.com>

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* Removed sstore from node-template

* Sort out data path

* Added offline check

* Removed dispatch_statement

* Renamed into_generic

* Fixed commit placement

* Use HashSet for tracking peers/statements

* fmt

* Use ExtendedHostFunctions

* Fixed benches

* Tweaks

* Apply suggestions from code review

Co-authored-by: cheme <emericchevalier.pro@gmail.com>

* Fixed priority mixup

* Rename

* newtypes for priorities

* Added MAX_TOPICS

* Fixed key filtering logic

* Remove empty entrie

* Removed prefix from signing

* More documentation

* fmt

* Moved store setup from sc-service to node

* Handle maintenance task in sc-statement-store

* Use statement iterator

* Renamed runtime API mod

* fmt

* Remove dump_encoded

* fmt

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* Fixed build after applying review suggestions

* License exceptions

* fmt

* Store options

* Moved pallet consts to config trait

* Removed global priority

* Validate fields when decoding

* Limit validation channel size

* Made a comment into module doc

* Removed submit_encoded

---------

Co-authored-by: cheme <emericchevalier.pro@gmail.com>
Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/bin/node/runtime/Cargo.toml

@@ -39,6 +39,7 @@ sp-runtime = { version = "7.0.0", default-features = false, path = "../../../pri
 sp-staking = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/staking" }
 sp-session = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/session" }
 sp-transaction-pool = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/transaction-pool" }
+sp-statement-store = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/statement-store" }
 sp-version = { version = "5.0.0", default-features = false, path = "../../../primitives/version" }
 sp-io = { version = "7.0.0", default-features = false, path = "../../../primitives/io" }
 
@@ -105,6 +106,7 @@ pallet-staking = { version = "4.0.0-dev", default-features = false, path = "../.
 pallet-staking-reward-curve = { version = "4.0.0-dev", default-features = false, path = "../../../frame/staking/reward-curve" }
 pallet-staking-runtime-api = { version = "4.0.0-dev", default-features = false, path = "../../../frame/staking/runtime-api" }
 pallet-state-trie-migration = { version = "4.0.0-dev", default-features = false, path = "../../../frame/state-trie-migration" }
+pallet-statement = { version = "4.0.0-dev", default-features = false, path = "../../../frame/statement" }
 pallet-scheduler = { version = "4.0.0-dev", default-features = false, path = "../../../frame/scheduler" }
 pallet-society = { version = "4.0.0-dev", default-features = false, path = "../../../frame/society" }
 pallet-sudo = { version = "4.0.0-dev", default-features = false, path = "../../../frame/sudo" }
@@ -187,6 +189,7 @@ std = [
 	"pallet-staking/std",
 	"pallet-staking-runtime-api/std",
 	"pallet-state-trie-migration/std",
+	"pallet-statement/std",
 	"pallet-salary/std",
 	"sp-session/std",
 	"pallet-sudo/std",
@@ -204,6 +207,7 @@ std = [
 	"pallet-treasury/std",
 	"pallet-asset-rate/std",
 	"sp-transaction-pool/std",
+	"sp-statement-store/std",
 	"pallet-utility/std",
 	"sp-version/std",
 	"pallet-society/std",
@@ -330,6 +334,7 @@ try-runtime = [
 	"pallet-session/try-runtime",
 	"pallet-staking/try-runtime",
 	"pallet-state-trie-migration/try-runtime",
+	"pallet-statement/try-runtime",
 	"pallet-scheduler/try-runtime",
 	"pallet-society/try-runtime",
 	"pallet-sudo/try-runtime",