Play a specific tag quickly

[dacap]

An user proposed a mockup where a play button could appear in the tags lines to play that specific tag. Not sure if this should be added exactly as it was requested or in some other way (probably mixing other features).

At the moment a workaround is the "focus tag" feature: https://aseprite.org/docs/focus-tag/

Internal ticket: https://igarastudio.zendesk.com/agent/tickets/6017