fix: add cosmos_proto.implements_interface (backport cosmos#1740) (co…

…smos#1816)

* fix: add cosmos_proto.implements_interface (cosmos#1740)

* fix: add cosmos_proto.implements_interface

* changelog

* Update CHANGELOG.md

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>

* run `make proto-all`

* run `go mod tidy`

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>
(cherry picked from commit 40d0ff7)

* fix conflicts

Co-authored-by: Dan Lynch <pyramation@gmail.com>
Co-authored-by: crodriguezvega <carlos@interchain.io>