Add Errors collection

[max-zilla]

Standardize error catching as part of transactional implementation.

• Add Error model which captures maybe the module, method, error, timestamp, etc.
• Add internal service util function we can call to log entries to that error collection (e.g. Elasticsearch is down when file is being uploaded -> log error, terminate (rolling back if necessary) the upload)

[max-zilla]

#152