INIT: generate cosmos-sdk mock modules

[Pantani]

create a make or script command to fetch the cosmos-sdk and auto-generate the mocks for a module

eg:

make generate-sdk-mock ARGS="staking,bank"
or
./scripts/generate-sdk-mock staking,bank

This command should clone the cosmos-sdk repo and run the mockery into the module folder.

This can be useful if the module updates or we need to add support to mock a new module.

[Pantani]

also we should have a command to generate SPN mocks as well

make generate-spn-mock ARGS="profile,campaign"
or
./scripts/generate-spn-mock campaign,launch