[WIP] feat(services): scaffold api

[julienrbrt]

DO NOT REVIEW

ref: #3051

The scaffold API consists now of the following functions:

• AddModule(ctx context.Context, m *Module) error
  To be used for recent modules that support depinject, it wires the module in app_config.go and app.go
  It auto-detects the folder architecture of the module via code analysis.

• AddNonDepinjectModule(ctx context.Context, m *Module) error
  This does the same as AddModule expects it adds registers the module manually (by modifying RegisterStores and RegisterModules on the runtime app)

• AddCommand(ctx context.Context, c *Command) error
  AddCommand simply add custom commands in the commands.go file of an app (of where the root command is registered).

That service focuses on the scaffolding of an app (and not modules). It can typically be used to replace logic from the wasm app and as basis of the future Cosmod app.