Add pre-configured flavors on create app command

[ferrarafer]

Add development, production and staging flavors to the app when using create app command.

[FilledStacks]

Feature

• Add development, production, and staging flavors to the CLI template for mobile
• Add development, production, and staging flavors to the CLI template for web

This feature will be complemented by #949 so they have to be done in the same release

[sebastianbuechler]

Maybe interesting for this feature could be the implementation of the "very good cli" from very good ventures as they setup flavors by default: https://cli.vgv.dev/docs/templates/core