[FEAT] Extend the Analyses to other Hard Forks

[iamrecursion]

Description

Currently the storage layout analysis only includes gas costs based on the current hard fork. We want to be able to analyse contracts compiled for other hard forks, and hence should allow specifying differing gas costs based on the fork or chain.

This should be similar to the work for #14.

Spec

• Add a supportedForks(&self) -> Vec<u8> method to the Opcode trait.
• Alter the min_gas_cost method to also take a fork_version parameter that lets it return different gas based on the fork it is 'executing' under.
• Take the fork as a parameter when starting the analysis, and pass it through.