External hotkey commands: tagging, linting and checking sync#1498

Niloth-p wants to merge 4 commits intozulip:mainzulip/zulip-terminal:mainfrom

Niloth-p:category/1498-lint-and-sync-readline/prNiloth-p/zulip-terminal:category/1498-lint-and-sync-readline/prCopy head branch name to clipboard