Expose failed shell command in ShellError

[micahjon]

First off, Bun's shell tools are awesome, props to building a great API here!

One nice to have: include the failed command as a ShellError property. Right now when I'm reporting a ShellError to Sentry, I extract stdout, stderr to include as error context. It'd be really nice to be able to include the original command as well. I realize I can look at the source, but the source changes w/ time and it'd be nice to have a definitive string for the shell command that produced the exit code, especially in the case of dynamically-constructed shell commands.

e.g. ShellError.command or something to that effect.

[Jaid]

I would also love to be able to access the command in non-failing executions.

const args = ['a', 'b c']
const execPromise = Bun.$`echo ${args}`.quiet()
console.write(`${execPromise.command} → `)
const execResult = await execPromise
console.log(execResult.text())