feat(forge build): prettify compiled contract JSON artifacts

[gnapoli23]

Component

Forge

Describe the feature you would like

It would be easier to read JSON artifacts by having them compiled in a pretty way, maybe using a setting in the foundry.toml file allowing you to specify tabs and spaces for the output.
Using an external tool to do so it's only a temporary workaround, 'cause the contract would be always compiled in a non-pretty form if you make some changes and have the need of rebuilding it.

Additional context

No response

[zerosnacks]

Hi @gnapoli23 thanks for your suggestion

I think this is relevant to the foundry/compilers repo, moving it there

compilers/crates/compilers/src/artifact_output/mod.rs

Line 129 in afa7569

utils::write_json_file(&self.artifact, &self.file, 64 * 1024)

A downside would be that pretty formatted artifacts have a larger filesize and it could be a breaking change if users are currently parsing by line as we expect in some other cases of JSON output

[gnapoli23]

Would be worth considering it as an optional feature which can be enabled on demand?
Eg in foundry.toml:

...
[output.fmt]
pretty = true
tabs = 2