Add bin/shakapacker-watch binstub for clean Ctrl-C shutdown

**Metr Tracking Issue**

**Category**: bug_fix
**Commits**: 1
**Lines changed**: 116 (+101/-15)
**Time span**: 0 hours

**PRs**:
- #1026 - Add bin/shakapacker-watch binstub for clean Ctrl-C shutdown

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<summary>Commit details</summary>

- `4cd5250` Add bin/shakapacker-watch binstub for clean Ctrl-C shutdown (#1026) (+101/-15)

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