Include forge coverage report

[naps62]

It would be useful to get coverage metrics of the EVM test suite

However, that is currently blocked due to compiler issues: coverage checks currently run without optimizations, and without --via-ir, which results in larger / complex contracts failing with "Stack too deep" errors

Some quick research seems to indicate this will be solved in solidity 0.8.21 (next version, no due date yet), so perhaps once that's out we can run coverage by compiling the contracts specifically with that version (or by updating to that compiler if it makes sense)

Relevant issues:

• bug(forge coverage): stack too deep when using --ir-minimum foundry-rs/foundry#3357
• Enable minimal yul optimizations by default. ethereum/solidity#13972

[naps62]

Update, this is now doable by updating foundry, and running forge coverage --ir-minimum (foundry-rs/foundry#5349)

here's a sample run, on my testing branch