feat(ethers-solc): add with_via_ir_minimum_optimization

[spockP]

Motivation

related to foundry-rs/foundry#5349:

More and more people (including myself) are using the magical via-ir to solve the "stack too deep" issue. However, this would cause problems in test coverage as all the optimizations are disabled in test coverage.

The solidity team suggests working around this issue by enabling "via-ir" with a ethereum/solidity#12533 (comment)

And this workaround is also recommended in the FAQ of solcoverage.

In this pr, a new "--ir-minimum" option is added to the coverage subcommand, which enables "via-ir" with a minimum amount of optimization.

And @mattsse suggests adding a function to the Settings type in ethers-solc.

Solution

Add a function called with_via_ir_minimum_optimization for enabling viaIR with a minimum amount of optimization.

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[DaniPopes]

Thanks!