* 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 <[email protected]>

* Apply suggestions from code review

Co-Authored-By: Nikolay Volf <[email protected]>

* 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 <[email protected]>
Co-authored-by: Cecile Tonglet <[email protected]>
Co-authored-by: Nikolay Volf <[email protected]>