feat: Add a lazily initialized in mem client for ffi etc. #40

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	43s
Android Build Only (aarch64-linux-android)	1m 6s
Android Build Only (armv7-linux-androideabi)	1m 8s
Checking fmt	18s
Checking docs	56s
check_semver	1m 13s
clippy_check	1m 32s
Cross Test (i686-unknown-linux-gnu)	19m 0s
cargo deny	30s
codespell	4s
Minimal Supported Rust Version	1m 3s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 16s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 47s
CI Test Suite / Tests (ubuntu-latest, stable, none)	44s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 14s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 2s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 50s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 14s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	45s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 6s
	38m 31s

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