Add TIMM models to the classification finetuning codebase

[aa-hernandez]

Search before asking

• [x] I have searched the Pytorch-Wildlife issues and found no similar bug report.

Description

We want to include more classification models for users to use on their training data! Help us adapt TIMM to the Pytorch-Wildlife classification module.

Use case

No response

Additional

No response

Are you willing to submit a PR?

• [ ] Yes I'd like to help by submitting a PR!