Dummy circuit for large ecalls

[naure]

Depends on the syscall trace generator: scroll-tech#717

This is a placeholder for upcoming precompile circuits. The real implementation must have the same effects as this one (same memory writes, etc).

• LargeEcallDummy is an extension of the dummy circuit to support precompiles.
• Support any number of registers and memory accesses.
• New testing technique using the real trace generator instead of artificial StepRecord’s. See keccak_step.