Add rand_distr::TruncatedNormal #1135

Job	Run time
Check doc	33s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	18m 3s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	3m 9s
test-ios	23s
test (macos-latest, x86_64-apple-darwin, stable)	3m 0s
test-miri	4m 31s
test (windows-latest, x86_64-pc-windows-gnu, stable)	5m 28s
test-no-std	13s
test (windows-latest, x86_64-pc-windows-msvc, beta)	4m 20s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.61.0)	5m 15s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	4m 49s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	3m 36s
	53m 20s

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