Add `VM.HwConfig` Support

[nayuta723]

Overview

Add VM.HwConfig Support

Implement hardware configuration support for VM-based runtimes:

• Add HWConfig struct (including device_tree, vcpus, memory, etc.)
• Add IOMems struct

Runtime Spec Reference

Implemented in runtime-spec as follows:

Found in https://github.com/opencontainers/runtime-spec/blob/main/specs-go/config.go:

HWConfig

// Hardware configuration for the VM image
type HWConfig struct {
	// Path to the container device-tree file that should be passed to the VM configuration.
	DeviceTree string `json:"deviceTree,omitempty"`
	// Number of virtual cpus for the VM.
	VCPUs *uint32 `json:"vcpus,omitempty"`
	// Maximum memory in bytes allocated to the VM.
	Memory *uint64 `json:"memory,omitempty"`
	// Host device tree nodes to passthrough to the VM.
	DtDevs []string `json:"dtdevs,omitempty"`
	// Allow auto-translated domains to access specific hardware I/O memory pages.
	IOMems []IOMems `json:"iomems,omitempty"`
	// Allows VM to access specific physical IRQs.
	Irqs []uint32 `json:"irqs,omitempty"`
}

IOMems

// IOMems contains information about iomem addresses that should be passed to the VM.
type IOMems struct {
	// Guest Frame Number to map the iomem range. If GFN is not specified, the mapping will be done to the same Frame Number as was provided in FirstMFN.
	FirstGFN *uint64 `json:"firstGFN,omitempty"`
	// Physical page number of iomem regions.
	FirstMFN *uint64 `json:"firstMFN"`
	// Number of pages to be mapped.
	NrMFNs *uint64 `json:"nrMFNs"`
}

Related to #309