File size warning

New Dataloader method that compares file size with available memory and throws error if there is not enough. If force_load == True, it prints warning and tries to load anyways. If virtual_stack == True, it doesn't check at all. Added the logic into dataloader.

New function in utils for checking file size.

requested review from @fima

assigned to @s233039

added 8 commits

• 2d6663f5...8abe2b39 - 7 commits from branch main
• f16756ec - Merge branch 'main' into 'memory_warning'

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• f45eb8b6 - Refactor of error message

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• d185e25a - Refactored loading of examples

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• fc458224 - Comment deletion

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• 7501275c - Refactoring issue fixed

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• b335fc33 - Comments deletion

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approved this merge request

merged

mentioned in commit 584ad739