agreement: add two fields for taggedDeadline backwards compatibility#5669

cce merged 2 commits into

algorand:yossi/taggedDeadlinesalgorand/go-algorand:yossi/taggedDeadlinesfrom

cce:cce/taggedDeadlines-twofieldscce/go-algorand:cce/taggedDeadlines-twofieldsCopy head branch name to clipboard