* Add HasAccount to the AuthKeeper to save protobuf decoding time We found in the Osmosis epoch time, the many accesses to GetAccount's proto unmarshalling was a significant slowdown. This adds a HasAccount method to the AuthKeeper, and fixes one unnecessary spot that it appears within in SendCoins * Update Spec * Add Changelog entry * Fix lint & use speedup in SendCoins * Update x/auth/keeper/account.go Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com> Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>