Convert MerkleTree timestamp from Long to java.time.Instant for better type safety#31

mitchelllisle merged 5 commits intomainmitchelllisle/maskala:mainfrom

copilot/fix-fdd27117-d65f-4381-9367-15645fb23502mitchelllisle/maskala:copilot/fix-fdd27117-d65f-4381-9367-15645fb23502Copy head branch name to clipboard