Add CustomTypesDataLoader for handling any iterable dataloader

[ved1beta]

What does this PR do?

This PR adds support for custom types in data loaders, allowing any iterable dataloader-like object to be used with proper device placement. This enhancement improves flexibility when working with custom data structures while maintaining compatibility with Accelerate's device management features.

Specifically, this PR:

1. Introduces a new CustomTypesDataLoader class that can handle any iterable dataloader-like object
2. Modifies the DataLoaderConfiguration to support custom types
3. Adds proper tensor conversion and device placement handling
4. Includes comprehensive tests to validate the functionality

Fixes #2975

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue? Yes, see Barebones dataloader to allow for any type of iterable dataloader-like object to be used. Should just handle device placement #2975
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests? Yes, added test_custom_types_dataloader

Who can review?

@SunMarc @zach-huggingface as this touches core parts of the library, specifically the data loader functionality.

The changes include:

• New data loader class in core library
• Device placement handling
• Test suite additions

[SunMarc]

Sorry for the wait, I'll have a look at this soon !

[github-actions]

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