health: add formatter binary

[jzelinskie]

I noticed that some languages have external formatters that are not a part of their LSP configuration.
To surface that information, this PR adds a new output to --health that displays the formatter binary.

In the future, this could be expanded to look for other fields that contain commands from the language config.

Here's some example output.

$ cargo run -- --health go
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `target/debug/hx --health go`
Configured language server: gopls
Binary for language server: /Users/jzelinskie/.local/share/go/bin/gopls
Configured debug adapter: dlv
Binary for debug adapter: /Users/jzelinskie/.local/share/go/bin/dlv
Highlight queries: ✓
Textobject queries: ✓
Indent queries: ✓
$ cargo run -- --health cue
    Finished dev [unoptimized + debuginfo] target(s) in 0.07s
     Running `target/debug/hx --health cue`
Configured language server: cuelsp
Binary for language server: /Users/jzelinskie/.local/share/go/bin/cuelsp
Configured debug adapter: None
Binary for formatter: /opt/homebrew/bin/cue
Highlight queries: ✓
Textobject queries: ✘
Indent queries: ✘

[g-re-g]

Might make it more generic for checking any binary exists? Might not get the lock on stdout if the binary's path is None.

Suggested change

	fn probe_commands(formatter_cmd: Option<String>) -> std::io::Result<()> {
	let stdout = std::io::stdout();
	let mut stdout = stdout.lock();
	if let Some(cmd) = formatter_cmd {
	let path = match which::which(&cmd) {
	Ok(path) => path.display().to_string().green(),
	Err(_) => format!("'{}' not found in $PATH", cmd).red(),
	};
	writeln!(stdout, "Binary for formatter: {}", path)?;
	}
	Ok(())
	}
	fn probe_binary(binary_name: &str, binary_path: Option<String>) -> std::io::Result<()> {
	if let Some(bin) = binary_path {
	let stdout = std::io::stdout();
	let mut stdout = stdout.lock();
	let path = match which::which(&bin) {
	Ok(path) => path.display().to_string().green(),
	Err(_) => format!("'{}' not found in $PATH", bin).red(),
	};
	writeln!(stdout, "Binary for {}: {}", binary_name, path)?;
	}
	Ok(())
	}

[rayanpiro]

I feel more comfortable with a solution like this.

In this case probe_commands has the same goal that probe_protocol. So just change some naming and the calls from the LSP, DAP and add the formatter one.

Tests OK and is working properly.

[jzelinskie]

Fixed in #7986