Fix: remove ad-hoc filter parsing for numeric fields

[afagundes]

This PR fixes issue #655

[asimpson]

I'm going to defer to @SpencerTorres on this one since he probably knows the implications on Clickhouse for this change.

[bossinc]

This is tricky. It would be best to pass the correct type to CH so it doesn't have to parse strings. (if @SpencerTorres says it's not a big deal, then let's go with the current approach)
As an alternative approach, we could allow filter values not to add quotes if quotes are already in the value. So '123' wouldn't become ''123''. What are your thoughts @afagundes

[asimpson]

LGTM, thanks! 🚀