feat(forge test): add --skip flag for forge test to skip compilation of specific files or folders

[wjorgensen]

Component

Forge

Describe the feature you would like

There is a skip flag for forge build but no skip flag for forge test when it builds the project. I want to be able to skip compilation of non essential files when I'm only testing one specific file or function. In addition to a general skip flag when I use the --match-contract and --match-test flags there should be a flag to only compile the files that are used by the contract or test.

Desired behavior

forge test --skip /script

Skips the compilation of all files in the script folder

forge test --match-contract Test1 --skip

Only compiles files imported and used within the Test1 contract.

Additional context

For context why I am asking for this feature is because I am building a tool called Solidings which is a version of Rustlings but for solidity. I'm trying to use foundry tests to check for completion of files but I can't run forge test because it compiles all of the files in the project every time it runs even when I'm running --match-contract or --match-test. This means that for forge test to be able to run the user must complete all of the files in the entire project. This doesn't work because just like Rustlings I would like for the user to be able to check each file as the complete them.

[zerosnacks]

Related: foundry-rs/compilers#197

[cuiweixie]

If this feature is accept, can I try to develop this feature.