feat: `import_verifiable_stream` and `write_verifiable_stream` in `Store` #35

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	43s
Android Build Only (aarch64-linux-android)	1m 7s
Checking docs	59s
Android Build Only (armv7-linux-androideabi)	1m 22s
check_semver	1m 34s
Cross Test (i686-unknown-linux-gnu)	30m 15s
cargo deny	29s
Checking fmt	30s
clippy_check	2m 9s
codespell	6s
Minimal Supported Rust Version	1m 1s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 16s
CI Test Suite / Tests (ubuntu-latest, stable, none)	45s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 1s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 40s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 12s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 12s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	46s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 42s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 5s
	50m 54s

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