Add config tests for including provider config files #88

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	33m 34s
minimal (windows-2019)	7m 56s
plain (windows-2019)	14m 34s
minimal (windows-2022)	8m 45s
plain (windows-2022)	15m 35s
shared (windows-2019, win64, enable-fips)	26m 29s
shared (windows-2019, win32, --strict-warnings no-fips)	29m 16s
shared (windows-2022, win64, enable-fips)	34m 30s
shared (windows-2022, win32, --strict-warnings no-fips)	29m 25s
	3h 20m 4s

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