Modified fuzz tests about field operations #73

Job	Run time
Build Docker image	19s
x64 (MSVC): C++ (public headers)	32s
x64 (MSVC): Windows (VS 2022, shared)	8m 47s
x64 (MSVC): Windows (VS 2022, static)	8m 10s
x64 (MSVC): Windows (VS 2022, int128_struct)	8m 2s
x64 (MSVC): Windows (VS 2022, int128_struct with __(u)mulh)	7m 7s
x86 (MSVC): Windows (VS 2022)	12m 17s
x86_64: macOS Ventura (int64, yes, yes, yes, yes)	4m 25s
x86_64: macOS Ventura (int64, yes, yes, yes, yes, gcc)	4m 45s
x86_64: macOS Ventura (int128_struct, 2, 4)	2m 40s
x86_64: macOS Ventura (int128, yes, yes, yes)	3m 30s
x86_64: macOS Ventura (int128, yes, yes)	2m 35s
x86_64: macOS Ventura (int128, yes, yes, yes, yes, gcc)	3m 58s
x86_64: macOS Ventura (int128, yes, yes, yes, yes, -DVERIFY)	4m 6s
x86_64: macOS Ventura (distcheck)	3m 33s
SageMath prover	58s
x86_64 (mingw32-w64): Windows (Debian stable, Wine)	9m 26s
i686 (mingw32-w64): Windows (Debian stable, Wine)	11m 21s
	1h 36m 31s

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