Filter models by inference status

[Wauplin]

This PR:

• adds an inference field to ModelInfo (can be requested using expand[])
• adds a filter inference to list_models. Can be "warm", "cold" or "frozen"

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[hanouticelina]

thanks @Wauplin, looks good to me 👍

[Wauplin]

Thanks! Failing tests are unrelated so let's merge :)