zkevm: add ECRECOVER, SHA2-256, IDENTITY and RIPEMD precompiles

[jsign]

This PR:

• Adds tests four new precompiles: ECRECOVER, SHA2-256, IDENTITY, and RIPEMD.
• Removes zkevm pytest markers since the testing framework now automatically does this.
• Uses Environment() configured gas limits, which are expected to be correctly set via the new --block-gas-limit filling flag.
• I updated the CI pipeline to use 36M gas limit for filling.

Cycle counts in the new precompiles:

• ECRECOVER: 682 million cycles
• SHA2-256: 5.8 billion cycles
• IDENTITY: 305 million cycles
• RIPEMD: 360 million cycles

The last three are all part of a generic test since these precompiles have the same input parameter structure (i.e., data). The generic test automatically discovers the optimal input length for each case to amortize the static cost as much as possible against the quadratic cost of memory expansions. ECRECOVER is a separate test since the parameter input structure is particular.

[chfast]

These are not zkevm specific but good general benchmarks for EVM. Can we make this framework for benchmarks a bit more generic? I'd like to contribute my existing benchmarks and more.

[jsign]

@marioevz, can you take a look at this PR? Since I'm touching the filling command, I would prefer to have some quick check from you if sounds good!

[marioevz]

Two minor comments, thanks!