chore(sims): copy makefiles from cosmos-sdk (#495)

sources:
* https://github.com/cosmos/cosmos-sdk/blob/v0.47.14/Makefile
* https://github.com/cosmos/cosmos-sdk/blob/v0.47.14/contrib/devtools/Makefile

closes #483

Signed-off-by: Julian Strobl <jmastr@mailbox.org>