feat: add fee abstraction app

[Pantani]

needs ignite/cli#4319 be backported first

[julienrbrt]

Should we make the name of the app more general? Maybe this app can scaffold multiple other third party modules eventually ?

[Pantani]

Should we make the name of the app more general? Maybe this app can scaffold multiple other third party modules eventually ?

I like the idea, but it is more complex since each module has different ways to add. For example, the wasm app needs more configuration or ante handlers. Maybe we can think of a solution to do it together; I can think of some solutions, but nothing easy to do or maintain