Update json and proto encoder to always accept None type, cleanup code / tests a little bit#5305

xrmx merged 11 commits into

open-telemetry:mainopen-telemetry/opentelemetry-python:mainfrom

DylanRussell:extended_attributes_encoding_onlyDylanRussell/opentelemetry-python:extended_attributes_encoding_onlyCopy head branch name to clipboard