Add trust_remote_code argument to ReaderHfds

[grodino]

Hi !

Some datasets on huggingface require the execution of code downloaded from the hub.
Since a few months, this now requires to set the flag trust_remote_code=True in load_dataset().

This PR adds the trust_remote_code argument to ReaderHfds. This means that we can now do:

from timm.data import create_dataset

imagenet = create_dataset(
    "hfds/imagenet-1k",
    root="data/,
    download=True,
    split="train",
    trust_remote_code=True,
)

Best,
Augustin

[rwightman]

@grodino thanks, looks good... I'll merge this now, if you want to also add arg support in train.py and validation.py and ensure create_dataset is called with the flag from args .... something like --dataset-trust-remote-code (in case I add model remote code support eventually), that'd be a good follow on PR :)

[grodino]

Sure, done 👉 #2328