msglist: Add double-tap to toggle thumbs up reaction.#1307

E-m-i-n-e-n-c-e wants to merge 1 commit intozulip:mainzulip/zulip-flutter:mainfrom

E-m-i-n-e-n-c-e:DoubleTapE-m-i-n-e-n-c-e/zulip-flutter:DoubleTapCopy head branch name to clipboard