Implement Distribution<u64> support for Zeta, Zipf #1106

Job	Run time
Check doc	32s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	19m 22s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	3m 17s
test (macos-latest, x86_64-apple-darwin, stable)	3m 7s
test (windows-latest, x86_64-pc-windows-gnu, stable)	3m 57s
test-miri	4m 31s
test-ios	24s
test (windows-latest, x86_64-pc-windows-msvc, beta)	4m 15s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.61.0)	5m 1s
test-no-std	14s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	4m 47s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	3m 37s
	53m 4s

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