[ACPI] Add support for ACPI Power Management

[dianpopa]

Feature Request

This is a feature tracking issue for the work to enable power management support for Firecracker microVMs through ACPI.

Describe the desired solution

Implement virtual power management via ACPI which will result in the usual power related commands (reboot, halt, shutdown) not needing a dedicated device (i.e i8042 on x86_64).

Describe possible alternatives

No other alternatives are taken into account.

Checks

• [ ] Have you searched the Firecracker Issues database for similar requests?
• [ ] Have you read all the existing relevant Firecracker documentation?
• [ ] Have you read and understood Firecracker's core tenets?

[wearyzen]

We will track this as part of internal activity so closing this for now.