feat(forge-lint): Refactor linting to enable support for multiple languages

[0xKitsune]

This PR introduces a new ProjectLinter type that enables support for any linter that implements the Linter trait. This will allow other languages like Vyper to implement linting without changes to forge lint.

pub struct ProjectLinter<L>
where
    L: Linter,
{
    pub linter: L,
}

// --snip--

pub trait Linter: Send + Sync + Clone {
    type Language: Language;
    type Lint: Lint + Ord;
    type LinterError: Error;

    fn lint(&self, input: &[PathBuf]) -> Result<LinterOutput<Self>, Self::LinterError>;
}

Currently, forge lint infers the linter via the Project struct. The only linter supported at the moment is the SolidityLinter.

impl LintArgs {
    pub fn run(self) -> Result<()> {
        let config = self.try_load_config_emit_warnings()?;
        let project = config.project()?;
     
        // --snip--
     
        let linter = if project.compiler.solc.is_some() {
            SolidityLinter::new()
                .with_severity(self.severity)
                .with_description(self.with_description)
        } else {
            todo!("Linting not supported for this language");
        };

      // --snip--

      let output = ProjectLinter::new(linter).lint(&sources)?;
    }
}