Create interface for filters and integrate into revid

[Ella Pietraroia]

Creating an interface for filters (e.g. motion detection, audio filter, etc) that will be added into the revid pipeline. Using a motion detection filter will hopefully reduce the bandwidth and storage needed for video that we are capturing that does not contain any useful information.

[Ella Pietraroia]

Design document: https://docs.google.com/document/d/1f3p02tDoqr_HKpwjBHENQTozVlYemcb8NdacE_Y3vkM/edit#

[Saxon Milton]

Resolved in PR #310