`canonicalAddress` and `humanAddress` are useful functions for all cosmos chains so move it into a new cosmos package. This also means we need to stop hardcoding "terra" in `humanAddress` and take the human readable part as a parameter instead.
Change-Id: I1125030b0f09b29567c19ca9adec7866695e2262
Change-Id: I8c7609d133c32cea9a773e05fa6c115c4a8e8666