feat: `import_verifiable_stream` and `write_verifiable_stream` in `Store` #142

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	39s
Android Build Only (aarch64-linux-android)	1m 15s
Checking docs	54s
Android Build Only (armv7-linux-androideabi)	1m 4s
Checking fmt	33s
check_semver	1m 9s
clippy_check	1m 19s
Cross Test (i686-unknown-linux-gnu)	2m 2s
cargo deny	33s
codespell	6s
Minimal Supported Rust Version	1m 2s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 36s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 54s
CI Test Suite / Tests (ubuntu-latest, stable, none)	48s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 13s
CI Test Suite / Tests (ubuntu-latest, stable, default)	55s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 24s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 31s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	49s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	59s
	21m 45s

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