This commit enhances the `Scheduler` to monitor VM states for completion, enabling more accurate termination detection. It introduces periodic polling combined with shutdown signals to halt operations gracefully. Additionally, VM lifecycle management in the hypervisor is updated with `state` retrieval for precise status assessments. The VM domain configuration now includes serial console support.
This commit improves the hypervisor by:
- Adding support for detecting base image formats using `qemu-img info`.
- Dynamically setting the base image format for overlay creation.
- Automatically converting non-raw images to raw format for bhyve compatibility.
- Updating `Cargo.toml` to include `serde_json` for JSON parsing.
- Modifying default working directory logic for `ZonesHypervisor`.
This commit replaces the `libvirt` crate with the `virt` crate for managing the libvirt backend on Linux. Key changes include:
- Updated `Cargo.toml` dependencies and feature configuration.
- Refactored hypervisor implementation to align with `virt` crate API.
- Improved error handling and lifecycle management for VMs and networks.
