Added tags and extra params to event constructor

Sentry defines additional parameters that are missing in your client
1. Tags: A map or list of tags for this event. [[1]]
2. Extra: An arbitrary mapping of additional metadata to store with the event. [[1]]

An additional note is that in the JSON blob will be assumed to be part of the data interface [[1]]. This could be uses to pass additional data to sentry.

[1]: https://sentry.readthedocs.org/en/latest/developer/client/index.html#building-the-json-packet