* Remove storageprefix package and merge with flattened database package

* Bump up database version

* Update packages/database/prefix.go

Co-authored-by: Ching-Hua (Vivian) Lin <jkrvivian@gmail.com>

Co-authored-by: Angelo Capossele <angelocapossele@gmail.com>
Co-authored-by: Ching-Hua (Vivian) Lin <jkrvivian@gmail.com>