Introduce the ability to interrupt exec() using signal (PR: #1469)

I initially created a PR right away considering the low complexity of the change but I'm not sure if it went under the radar or not.

https://github.com/actions/toolkit/pull/1469

Describe the enhancement
When creating js/ts actions, it's currently not possible to implement a timeout mechanism within only a portion of an action.

The NodeJS child.spaws() API used by the toolkit/action does support the signal mechanism.

The goal here is to make it possible to use signal in the action.

Code Snippet

try {
  core.info(`Command starting at: ${JSON.stringify(new Date())}`)
  await exec.exec("sleep 10000", [], {signal: AbortSignal.timeout(5000)})
  core.info(`Command completed at: ${JSON.stringify(new Date())}`)
} catch (error: any) {
  if (error.name === "AbortError") {
    core.info(`Timeout reached at: ${JSON.stringify(new Date())}. The command was interrupted`)
  } else {
    core.info(`There was an issue processing the command (${error.name}). It failed at: ${JSON.stringify(new Date())}`)
  }
}

Start at packages/exec/src/toolrunner.ts around line 437 and review PR #1469, which already proposes this enhancement. Confirm how the requested signal option should reach command execution, then verify that the timeout example can interrupt the command and report the resulting abort.