chore(signals): prefactor

[chris-olszewski]

Description

Prefactors:

• moved signal listening to own crate
• return signal received to subscribers
• support streams instead of single futures for signal sources

PR that prefactors the signals code to prepare for:

• Subscribers getting all signals sent to turbo
• Additional signal handlers to be sent transparently to children

There are no behavior changes in this PR. I highly suggest reviewing each commit on its own.

Testing Instructions

Existing unit tests.

Quick manual verification that existing SIGINT behavior remains the same:

$ turbo_dev watch build
...
│    Finalizing page optimization  .   Collecting build traces  .
└────>
  × Watch interrupted due to signal

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