LiveResource generator

[phyr97]

I tried to work with some code generators and wanted to implement a simple generator for a Backpex.LiveResource. This generator serves as a starting point to take an existing schema module and create a Backpex.LiveResource. Simple field types like :integer, :string, and :boolean are converted into their corresponding Backpex types.

I believe there are many possibilities to enhance this generator or create additional ones, such as for item actions or resource actions.

This is my first time creating a generator like this, so there may be some aspects that need to be handled differently.