Add virtio-PCI console for stdio through kernel broker

[Sangho Lee (sangho2)]

This PR adds a virtio console to support stdio through the kernel broker. It implements a modern virtio-PCI console on a generic transport and split virtqueue, reusable for future fs/9p and net/vsock devices, with DMA and MMIO provided by the kernel platform through a HAL trait. It also adds local APIC support to deliver the console's interrupts and to provide a deadline timer, so that BrokerEnter can block until a readiness notification (e.g., stdin) arrives or its deadline expires.

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

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--- failure function_parameter_count_changed: pub fn parameter count changed ---

Description:
A publicly-visible function now takes a different number of parameters.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/function_parameter_count_changed.ron

Failed in:
  litebox_broker_local_vm_userland::self_check now takes 2 parameters instead of 0, in /home/runner/work/litebox/litebox/litebox_broker_local_vm_userland/src/lib.rs:450

--- failure method_parameter_count_changed: pub method parameter count changed ---

Description:
A publicly-visible method now takes a different number of parameters, not counting the receiver (self) parameter.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/method_parameter_count_changed.ron

Failed in:
  litebox_broker_vm_kernel::Broker::new takes 0 parameters in /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_broker_vm_kernel/src/lib.rs:66, but now takes 1 parameters in /home/runner/work/litebox/litebox/litebox_broker_vm_kernel/src/lib.rs:89

--- failure declarative_macro_missing: macro_rules declaration removed or renamed ---

Description:
A `macro_rules!` declarative macro cannot be invoked by its prior name. The macro may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/reference/macros-by-example.html#path-based-scope
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/declarative_macro_missing.ron

Failed in:
  macro console_println, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_hal/src/console.rs:134

--- failure function_missing: pub fn removed or renamed ---

Description:
A publicly-visible function cannot be imported by its prior path. A `pub use` may have been removed, or the function itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/function_missing.ron

Failed in:
  function litebox_hal::console::panic_print, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_hal/src/console.rs:119
  function litebox_hal::console::print_str, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_hal/src/console.rs:113
  function litebox_hal::clock::calibrate_tsc_khz, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_hal/src/clock.rs:15
  function litebox_hal::console::print, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_hal/src/console.rs:108

--- failure module_missing: pub module removed or renamed ---

Description:
A publicly-visible module cannot be imported by its prior path. A `pub use` may have been removed, or the module may have been renamed, removed, or made non-public.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/module_missing.ron

Failed in:
  mod litebox_hal::console, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_hal/src/console.rs:4

--- failure struct_missing: pub struct removed or renamed ---

Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/struct_missing.ron

Failed in:
  struct litebox_platform_vm_kernel::clock::TscClock, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/63915d358563390052279cd90a5ba397be887e37/litebox_platform_vm_kernel/src/clock.rs:13