Add mlx-vlm

[mudler]

Description

This PR adds mlx-vlm as backend.

It is blocked by: Blaizzy/mlx-vlm#470
Extracted from: #6049 , leaving here for reference when it's unblocked upstream.

Notes for Reviewers

Once the PR is merged, install the mlx-vlm-development backend, and create a model file like the following:

mudler@mudlers-Mac-mini LocalAI % cat models/mlx-gemma.yaml
name: mlx-gemma
backend: mlx-vlm
parameters:
  model: "mlx-community/gemma-3n-E2B-it-4bit"
template:
  use_tokenizer_template: true
known_usecases:
- chat

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