Support libkrun (mostly for Virtio-GPU Venus), via krunkit

[AkihiroSuda]

libkrun seems to have merged the PR for supporting Virtio-GPU Venus (https://docs.mesa3d.org/drivers/venus.html)

• Extend virtio-gpu to support Venus on macOS containers/libkrun#174

QEMU still hasn't merged the patches for supporting Venus: https://patchew.org/Xen/20231219075320.165227-1-ray.huang@amd.com/

[AkihiroSuda]

lima should probably use https://github.com/containers/krunkit for implementing the libkrun driver.
Not sure if it should be a built-in driver, or we have to implement the plug-in system.

[balajiv113]

We can explore and finalise the approach for plug-in model. As i already see several experimental PR's for supporting different drivers.

This will help us in providing different options based on performance and usecases.