Integrate DB into the level db interface so db levels are the same as db #8
Description
Specification
Similar to #5, I find that it shouldn't be necessary in PK to have db and vaults running their own DB. The vaults is using EFS which has to use the root DB, but the operations should be workable under a sublevel of the DB used by all of PK.
To do this, the API of js-db has to be brought into the leveldb abstract interface, that creation of sublevels is the same as creating another DB.
Another way is to just make our level call return another DB instance, but always with the option of accessing the underlying .db property for the underlying leveldb to do certain operations.
This should be done with investigating #5 so that a consistent solution can be found.
Additional context
Tasks
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