Basic operator API #726

Job	Run time
Rustfmt	24s
clippy	29s
coverage	2m 55s
Check	28s
Test Suite (self-hosted, linux, x64, intel, self-hosted-linux-intel)	2m 49s
Test Suite (self-hosted, linux, arm64, --cfg=aes_armv8)	5m 51s
Test Suite (self-hosted, macos, arm64, --cfg=aes_armv8)	2m 30s
Test Suite (macos-latest, stable)	4m 4s
Test Suite (windows-2019)	4m 12s
Build library (ubuntu-latest, libpost.so, libpost.a, linux)	4m 27s
Build library (self-hosted, linux, arm64, libpost.so, libpost.a, --cfg=aes_armv8, linux-arm64)	8m 31s
Build library (self-hosted, macos, arm64, libpost.dylib, libpost.a, --cfg=aes_armv8, macos-m1)	2m 52s
Build library (macos-latest, libpost.dylib, libpost.a, macos)	8m 56s
Build library (windows-2019, post.dll, post.lib, windows)	10m 26s
Publish release	0s
	58m 54s

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