Check the character consistency workflows

[jbilcke-hf]

Context

In task #69 we make sure to always generate the entities of a scene.

However today we don't have a lot of workflows compatible with character consistency.

Solution

Review our workflows (Hugging Face, Fal.ai, Replicate etc)

Add or modify workflows so that they can support character consistency.

Typically we want to use this model: https://fal.ai/models/fal-ai/pulid

But perhaps we can also now use Flux