Move Encoded frame timestamps to Metadata dicts and rename to rtpTimestamp#1

Draft

tonyherre wants to merge 2 commits intotonyherre-capturetimefrom

tonyherre-capturetime-followup

Commits on Apr 24, 2023

Update name to plain 'timestamp'
Tony Herre
committed
Move Encoded frame types timestamp into Metadata
Tony Herre
committed