The closest I can find is https://steamcommunity.com/sharedfiles/filedetails/?id=777500967&searchtext=Mech where one of them shoot water, spray grass on the surface of tiles and shoot flower seeds. Aside from that I don't really know any mech or vehicle that can tilt, harvest and such.
Actually there is a mod that creates garden bots specifically for creating, maintaining and harvesting crops. The garden bots mod even provides you with a automatic digger bot, although you have to have these bots nearby for them to actually be working, this is unfixable as starbound does not use anything that is very far offscreen.