refactor(examples) Update custom-mods example

[jafermarq]

Make it use flwr new. Added some quality improvements to how W&B mode works

[chongshenng]

Thanks for the PR @jafermarq! It's a very timely one. Only minor comments.

[jafermarq]

Thanks for the PR @jafermarq! It's a very timely one. Only minor comments.

Thanks for the review ! I've pushed the missing __init__.py.

[chongshenng]

Thanks for the quick fix @jafermarq! Last batch of comments, mainly nits.

[chongshenng]

LGTM!