cipher_hmac_sha256{_hw.c, .c, .h}: add initial file for sha256 cipher #1507

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	8m 50s
minimal (windows-2019)	2m 7s
minimal (windows-2022)	2m 11s
plain (windows-2019)	2m 31s
plain (windows-2022)	2m 32s
shared (windows-2019, win64, enable-fips)	2m 57s
shared (windows-2019, win32, --strict-warnings no-fips)	2m 55s
shared (windows-2022, win64, enable-fips)	2m 58s
shared (windows-2022, win32, --strict-warnings no-fips)	3m 0s
	30m 1s

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