chore(cli): split forge, cast CLI args into separate modules

[DaniPopes]

Reduce compilation times and binary bloat.

1. Isolate forge and cast CLI args from each other since they do not share almost any code. (7e8ebdc)

2. The code they do share is extracted into foundry-cli. This is just CoreBuildArgs and ProjectPathsArgs from cmd::forge::build. (539f9d0)

Before:

cli/src
├── cast.rs      <--
├── cmd
│   ├── cast     <--
│   ├── forge    <--
│   └── ...
├── forge.rs     <--
├── opts
│   ├── cast.rs  <--
│   ├── forge.rs <--
│   └── ...
└── ...

After:

cli/src
├── cast  <--
│   ├── cmd
│   ├── main.rs
│   └── opts.rs
├── forge <--
│   ├── cmd
│   ├── main.rs
│   └── opts.rs
└── ...

[Evalir]

love this! pending @mattsse

[mattsse]

I love this,

unfortunately, this also needs a rebase

[DaniPopes]

Re Based

[mattsse]

lgtm