Add `Alphabetic` distribution #1270

Job	Run time
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	52s
Check Clippy and rustfmt	12s
Check doc	22s
test-ios	19s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	45s
test-miri	5m 2s
test-no-std	13s
test (macos-latest, x86_64-apple-darwin, stable)	50s
test (windows-latest, x86_64-pc-windows-gnu, stable)	4m 6s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 18s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.63.0)	2m 46s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	54s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	43s
	18m 22s

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