implement `UniformSampler<isize>` #1299

Job	Run time
Check Clippy and rustfmt	9s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	31s
Check doc	24s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	10s
test-ios	19s
test (macos-latest, x86_64-apple-darwin, stable)	21s
test-miri	31s
test-no-std	13s
test (windows-latest, x86_64-pc-windows-gnu, stable)	1m 20s
test (windows-latest, x86_64-pc-windows-msvc, beta)	55s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.63.0)	2m 22s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	34s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	14s
	8m 3s

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