refactor: add unified storage abstraction and SQLite backend support #769

Job	Run time
Checks / Format	13s
Checks / Clippy	8m 21s
Tests / Build & Test (Wasm)	4m 3s
Tests / Build & Test (macos-latest)	10m 36s
Tests / Build & Test (ubuntu-latest)	13m 32s
Tests / Build & Test (windows-2022)	15m 7s
Code Coverage (ubuntu-latest)	12m 0s
	1h 3m 52s

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