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/utils/frame/benchmarking-cli/Cargo.toml

@@ -26,5 +26,5 @@ structopt = "0.3.8"
 codec = { version = "1.3.0", package = "parity-scale-codec" }
 
 [features]
-default = ["rocksdb"]
-rocksdb = ["sc-client-db/kvdb-rocksdb"]
+default = ["db"]
+db = ["sc-client-db/kvdb-rocksdb", "sc-client-db/parity-db"]