This commit introduces a progress event and webhook system to the `borg collect` commands.
- A new `pkg/events` package has been created to handle event emission.
- The `collect github repos` command now has `--events`, `--webhook`, and `--event-log` flags to control event output.
- The command emits `collection_started`, `item_started`, `item_completed`, and `collection_completed` events during the collection process.
- Unit tests have been added to verify the new functionality.
Co-authored-by: Snider <631881+Snider@users.noreply.github.com>
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