Generate minimal application

[julienrbrt]

Is your feature request related to a problem or issue you encountered? Please describe.
Currently, Ignite generates a full Cosmos SDK chain, which contains almost all SDK modules and IBC.
While this is ok for a developer willing to quickly launch their chain, adding the possibility to create a minimal chain would help people to get familiar with the codebase easily and iterate on it and use that chain as a testing base.

Describe the solution you'd like
Add a flag to generate only a minimal application with the necessary Cosmos SDK module to make the chain launch:

ignite s chain foo --minimal

Describe alternatives you've considered
I am currently maintaining https://github.com/julienrbrt/chain-minimal, but I'd like to have support in Ignite directly.
Other developers have been doing the same: https://github.com/larry0x/simapp