Approval Voting improvements (#2781)

* extract database from av-store itself

* generalize approval-voting over database type

* modes (without handling) and pruning old wakeups

* rework approval importing

* add our_approval_sig to ApprovalEntry

* import assignment

* guide updates for check-full-approval changes

* some aux functions

* send messages when becoming active.

* guide: network bridge sends view updates only when done syncing

* network bridge: send view updates only when done syncing

* tests for new network-bridge behavior

* add a test for updating approval entry with sig

* fix some warnings

* test load-all-blocks

* instantiate new parachains DB

* fix network-bridge empty view updates

* tweak

* fix wasm build, i think

* Update node/core/approval-voting/src/lib.rs

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

* add some versioning to parachains_db

* warnings

* fix merge changes

* remove versioning again

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

polkadot/Cargo.lock

@@ -5650,6 +5650,7 @@ dependencies = [
  "assert_matches",
  "async-trait",
  "futures 0.3.13",
+ "futures-timer 3.0.2",
  "parity-scale-codec",
  "parking_lot 0.11.1",
  "polkadot-node-network-protocol",
@@ -5659,6 +5660,7 @@ dependencies = [
  "polkadot-primitives",
  "sc-authority-discovery",
  "sc-network",
+ "sp-consensus",
  "sp-core",
  "sp-keyring",
  "strum",
@@ -5692,7 +5694,6 @@ dependencies = [
  "futures-timer 3.0.2",
  "kvdb",
  "kvdb-memorydb",
- "kvdb-rocksdb",
  "maplit",
  "merlin",
  "parity-scale-codec",
@@ -5710,6 +5711,7 @@ dependencies = [
  "schnorrkel",
  "sp-application-crypto",
  "sp-blockchain",
+ "sp-consensus",
  "sp-consensus-babe",
  "sp-consensus-slots",
  "sp-core",
@@ -5730,7 +5732,6 @@ dependencies = [
  "futures-timer 3.0.2",
  "kvdb",
  "kvdb-memorydb",
- "kvdb-rocksdb",
  "log",
  "parity-scale-codec",
  "parking_lot 0.11.1",
@@ -5741,7 +5742,6 @@ dependencies = [
  "polkadot-node-subsystem-util",
  "polkadot-overseer",
  "polkadot-primitives",
- "sc-service",
  "sp-core",
  "sp-keyring",
  "thiserror",
@@ -6345,6 +6345,8 @@ dependencies = [
  "futures 0.3.13",
  "hex-literal",
  "kusama-runtime",
+ "kvdb",
+ "kvdb-rocksdb",
  "pallet-babe",
  "pallet-im-online",
  "pallet-mmr-primitives",