New database trait (#5549)

* Introduce trait

* The trait

* Generic

* Basic impls.

* Remove unneeded bounds

* Minor changes

* Switch over to the new DB trait

* Integrated parity-db and added CLI for db selection

* Default impl.

* Fix logs.

* Started integrating subdb

* Apply suggestions from code review

Co-Authored-By: Cecile Tonglet <cecile@parity.io>

* Apply suggestions from code review

Co-Authored-By: Nikolay Volf <nikvolf@gmail.com>

* Enable subdb

* Bump parity-db

* Fixed CLI macro

* Fixed browser build

* Fixed features

* Sort out features

* Use parity-db from crates.io

* Typo

Co-authored-by: arkpar <arkady.paronyan@gmail.com>
Co-authored-by: Cecile Tonglet <cecile@parity.io>
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>

substrate/bin/node/testing/src/bench.rs

@@ -184,7 +184,7 @@ impl BenchDb {
 			state_cache_size: 16*1024*1024,
 			state_cache_child_ratio: Some((0, 100)),
 			pruning: PruningMode::ArchiveAll,
-			source: sc_client_db::DatabaseSettingsSrc::Path {
+			source: sc_client_db::DatabaseSettingsSrc::RocksDb {
 				path: dir.into(),
 				cache_size: 512,
 			},