[Generating NFTs] Combine all generators steps in one #5

[dievazqu]

Description

Create a script/service that calls all the "generator steps" (#2415, #2416, #2417), so this should receive a list of images of different layers, and it returns the address of the deployed contract.

Acceptance Criteria

• [ ] When running this, it reads the layers images and the expected appearance percentage file from a folder (or maybe configurable?), and calls every "generator step", and returns the address of the deployed ntf contract. This has to be configurable to run in alfajores or mainnet.

[kathaypacific]

We can generate the NFTs by calling each step separately - this task will save us time if we create many NFT collections. So holding off for now