Support Server Side Filtering

[StuartFergusonVme]

Is your feature request related to a problem? Please describe.
N/A

Describe the solution you'd like
Support server side event filtering as introduced in ES 6.*

Describe alternatives you've considered
N/A

Additional context
See Server Side Filtering in this blog post https://eventstore.org/blog/event-store-6.0.0-preview-release/

[StevenBlair123]

This might be part of the Subscription Value Object.
if no filters defined, assume the caller wants all the events from the stream.