Make WTinyLFU / TinyLFU clonable #63

Job	Run time
rustfmt (ubuntu-latest)	5s
clippy (ubuntu-latest)	17s
rustfmt (macos-latest)	25s
clippy (macos-latest)	24s
rustfmt (windows-latest)	36s
clippy (windows-latest)	1m 27s
build (ubuntu-latest)	17s
cross (aarch64-unknown-linux-gnu)	2m 17s
build (macos-latest)	30s
cross (aarch64-linux-android)	2m 0s
build (windows-latest)	1m 7s
test (ubuntu-latest)	1m 13s
test (macos-latest)	1m 51s
cross (aarch64-unknown-linux-musl)	2m 11s
test (windows-latest)	3m 32s
cross (i686-linux-android)	2m 11s
docs	22s
cross (x86_64-linux-android)	2m 11s
miri (ubuntu-latest)	1m 6s
cross (i686-pc-windows-gnu)	2m 4s
miri (macos-latest)	1s
sanitizer (ubuntu-latest)	52s
cross (x86_64-pc-windows-gnu)	2m 9s
miri (windows-latest)	20s
sanitizer (macos-latest)	1m 34s
cross (i686-unknown-linux-gnu)	2m 9s
sanitizer (windows-latest)	37s
cross (powerpc64-unknown-linux-gnu)	2m 17s
cross (riscv64gc-unknown-linux-gnu)	1m 57s
cross (wasm32-unknown-unknown)	15s
cross (wasm32-unknown-emscripten)	2m 3s
coverage	0s
	40m 20s

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