Tests

Add KS tests for weighted sampling #1187

Job	Run time
Check doc	33s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 18s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	1m 14s
test (macos-latest, x86_64-apple-darwin, stable)	49s
test-ios	24s
test-miri	5m 3s
test (windows-latest, x86_64-pc-windows-gnu, stable)	4m 40s
test-ks	49s
test (windows-latest, x86_64-pc-windows-msvc, beta)	2m 11s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.63.0)	2m 59s
test-no-std	13s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 39s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	1m 24s
	23m 16s

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