[Proto] Automate proto-folder generation

[Thaleszh]

Is your feature request related to a problem? Please describe.
The packages/proto/proto is a folder with all the protofiles utilized in Kiichain. It used for the generation of the whole library, but the folder is currently being manually generated.

Describe the solution you'd like
We want a script that, once executed:

• Fetches the protofiles used in cosmos-sdk version of kiichain as well as kiichain's own protofiles.
• Runs packages/proto/scripts/codegen.ts correctly to update the source files in the repo.

[Coingraph]

Hi, I'm a beginner and would like to work on this issue. Can you assign it to me?