Bulk transformers generation

[cerbero90]

Enable the following scenarios:

make:transformer User Generate a transformer for User unless it exists already

make:transformer User --force Generate a transformer for User or overwrite it if exists

make:transformer Generate transformers for all models that don't have one

make:transformer --force Generate transformers for all models and overwrite the existing ones

make:transformer --all Generate transformers for all models that don't have one

make:transformer --all --force Generate transformers for all models and overwrite the existing ones

make:transformer --all=app/Models Generate transformers for all models in the app/Models directory that don't have one

make:transformer --all=app/Models --force Generate transformers for all models in the app/Models directory and overwrite the existing ones