Backfill Event Timestamp in Existing EVENT message files

[nicolemah99]

The event_timestamp field is now automatically added to message files during the download process. However, previously downloaded event files lack this timestamp. This task involves creating a script to backfill event_timestamp in these existing files.

1. Unzip event files into temp dir
2. Extract event_timestamp from *_metadata.yml.
3. Insert event_timestamp into the message file.
4. Remove temp dir

[nicolemah99]

This is what the message file format should look like:

{
  "meter_id": "KOTZ-735-GEN_17",
  "event_id": "10251",
  "filename": "KEA-events-KOTZ-735-GEN_17-202411-10251.zip",
  "md5sum": "",
  "data_type": "events",
  "event_timestamp": "2024-11-02T17:38:37"
}

[nicolemah99]

Line to parse in EVENTID_metadata.yml (2nd line)

event_timestamp: "2024-10-23T06:15:56"