fix available modules

[Borda]

What does this PR do?

Fixes #11524
Original fix was taken from Lightning-AI/torchmetrics#772

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cc @Borda

[tchaton]

LGTM !

[tchaton]

@Borda I think the requires decorator from Lightning Flash by @ethanwharris would also be a great addtion.

[Borda]

@Borda I think the requires decorator from Lightning Flash by @ethanwharris would also be a great addtion.

if whole function or class needs a certain dependency, then yes, but in Flash, in several places, we have a switch inside function/method body... anyway a wrapper is welcome but it is outside of scope of this PR 🐰