Filter to exclude events based on response status

[skoenig]

Currently, CalendarSync only filters out events that are declined. To provide more flexibility, it would be beneficial to allow to specify a list of responses (e.g., declined, tentatively agreed) that should be excluded from syncing.

For example, I want to exclude events where I have tentatively agreed, not just declined events.

Configuration could look like this:

# Filters remove events from being synced due to different criteria
filters:
  # Events with specific responses aren't synced
  - name: ResponseFilter
    ExcludeResponses: [declined, tentatively_agreed]

This could be a more flexible filter that could replace the current DeclinedEvents filter.