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Examine ESRT entries from UEFI Shell

This post details a simple UEFI shell utility for listing the contents of an EFI System Resource Table (ESRT). Essentially ESRT a catalog of firmware which can be updated with the UEFI UpdateCapsule mechanism described in section 7.5 of the UEFI Specification. The ESRT provides a mechanism for identifying integrated device and system firmware resources for the purposes of targeting firmware updates to those resources. Each entry in the ESRT describes a device or system firmware resource that can be targeted by a firmware update package. UEFI firmware must allocate and populate an ESRT system resource entry for itself (system