v1.2.0

### Added

* Added a new CPU template called `T2S`. This exposes the same CPUID as `T2` to
  the Guest and also overwrites the `ARCH_CAPABILITIES` MSR to expose a reduced
  set of capabilities. With regards to hardware vulnerabilities and mitigations,
  the Guest vCPU will apear to look like a Skylake CPU, making it safe to
  snapshot uVMs running on a newer host CPU (Cascade Lake) and restore on a host
  that has a Skylake CPU.
* Added a new CLI option `--metrics-path PATH`. It accepts a file parameter
  where metrics will be sent to.
* Added baselines for m6i.metal and m6a.metal for all long running performance
  tests.
* Releases now include debuginfo files.

### Changed

* Changed the jailer option `--exec-file` to fail if the filename does not
  contain the string `firecracker` to prevent from running non-firecracker
  binaries.
* Upgraded Rust toolchain from 1.52.1 to 1.64.0.
* Switched to specifying our dependencies using caret requirements instead
  of comparison requirements.
* Updated all dependencies to their respective newest versions.

### Fixed

* Made the `T2` template more robust by explicitly disabling additional
  CPUID flags that should be off but were missed initially or that were
  not available in the spec when the template was created.
* Now MAC address is correctly displayed when queried with GET `/vm/config`
  if left unspecified in both pre and post snapshot states.
* Fixed a self-DoS scenario in the virtio-queue code by reporting and
  terminating execution when the number of available descriptors reported
  by the driver is higher than the queue size.
* Fixed the bad handling of kernel cmdline parameters when init arguments were
  provided in the `boot_args` field of the JSON body of the PUT `/boot-source`
  request.
* Fixed a bug on ARM64 hosts where the upper 64bits of the V0-V31 FL/SIMD
  registers were not saved correctly when taking a snapshot, potentially
  leading to data loss. This change invalidates all ARM64 snapshots taken
  with versions of Firecracker <= 1.1.3.
* Improved stability and security when saving CPU MSRs in snapshots.