utils/vfio: Add APIs for VFIO container and device management

[dhsrivas]

This patch introduces a set of VFIO (Virtual Function I/O) helper APIs to simplify container, IOMMU group, and device management. The new functions provide a clean abstraction over common VFIO operations:

• get_vfio_container_fd() – open and validate a VFIO container
• check_vfio_container() – verify API version and IOMMU extension support
• get_iommu_group_fd() – obtain an IOMMU group file descriptor
• attach_group_to_container()/detach_group_from_container() – manage group association with a VFIO container
• get_device_fd() – retrieve a VFIO device file descriptor
• vfio_device_supports_irq() – check if a device supports the requested number of MSI-X interrupts

[coderabbitai]

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[pevogam]

Hi @dhsrivas , I think I can propose a fix for your failing CI variants in avocado-framework/avocado#6343. Once it gets merged I will ask you to rebase to the main branch and push again if possible so we can restore the coverage for your PR.

[pevogam]

Ok, merged. Could you please rebase on the master branch and push again?

[dhsrivas]

@pevogam If I understand correctly, you’d like me to re-push the PR. I’ve done that — please take a look when you have a moment. Thanks.

[pevogam]

Hi @dhsrivas, this PR needs accompanying documentation and unit tests as done in some previous commits migrating code like 210b17e or 3bdf5ff. Would you mind adding some of that?

@harvey0100 @PraveenPenguin The code rabbit claims this repo has under 10 stars so it denies us its autoreview functionality, could you star it and add more colleagues to star it so that we can recover the autoreview here?