Fuzzing VMs: Limit memory usage

[LuisPH3]

This PR adds a limit to the memory expansions generated by fuzzing tests. Nightly fuzzing has crashed a few times and the problem is attributed to large memory allocations.

The CT has a limit to the available gas for the execution of an instruction, large enough for a 450MB allocation. This limit may be too high for FuzzDifferentialLfvmVsGeth. During fuzzing, two resulting states are created by executing both geth and lfvm. This doubles the memory expansion.

The offending corpus:

go test fuzz v1
[]byte("\xa0") 
int64(499_999_999_947)   
byte('\x04')
[]byte("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1e\x00\xe90\x00")

Arguments are:

• op: LOG0
• gas: almost maximum allowed
• revision
• stack values: Last value is parameter size: 503_376_128 (480 MB)

The new code will not allow this execution by limiting gas to a 1/10 of the current limit.