Pre-release of the v2 hcsshim package and runhcs.exe

• Implements SignalProcess support for all LCOW, WCOW (Argon, Xenon) from RS1 -> RS5.
• Enables HotHints for V2 Xenon activation's on Windows greatly reducing startup time.
• Implements HCN Add/Remove policy workflows.
• Enables the use of SCSI for large layers rather than vPMEM for LCOW based activation's.
• Adds uvm-memory-type custom OCI annotation that allows you to customize the backing memory type of the Xenon at activation. Accepted values are:
  "Virtual" - Use VA backed memory for the Xenon.
  "VirtualDeferred" - Use VA backed memory with deferred commit for the Xenon.
  "Physical" - Use physically backed memory for the Xenon.