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Populate `alert_worker` in `com` bucket

Prior to this change, the `com` bucket of events alerted with an alert
plugin looked like the following example:

    "com": {
      "record_type": "mock_event",
      "origin_worker": "mockaudit-mockevent",
      "origin_type": "event",
      "event_worker": "mockaudit-mockevent",
      "store_worker": "mockaudit-filestore"
    }

Note that the last key in the example above is named as `store_worker`
although alerting is done by alert plugins. This was so because store
plugins and alert plugins implement the exact same interface via
duck-typing, so both types of plugins were worked on by a function named
`store_worker`.

While this makes sense for us (the developers), finding a `store_worker`
key in data written by an alert plugin could be confusing to a user.
Therefore, with this change, the `com` bucket of events alerted with an
alert plugin looks like this:

    "com": {
      "record_type": "mock_event",
      "origin_worker": "mockaudit-mockevent",
      "origin_type": "event",
      "event_worker": "mockaudit-mockevent",
      "alert_worker": "mockaudit-filestore"
    }

To accomplish this behaviour, `workers.py` has been refactored by moving
the existing `store_worker` functionality to an internal `_write_worker`
function which can work on both store and alert plugins. It accepts an
additional parameter that tells it whether to populate `store_worker` or
`alert_worker` in the `com` bucket. Now there are two functions
`store_worker` and `alert_worker` which invoke with the `_write_worker`
function with the additional parameter to populate the `com` bucket
appropriately.

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