aux_gen: Add new guid rule to [[rule]]

[Javagedes]

Description

Adds a new rule, guid, that generates a content validation entry header in the aux file.

• Impacts functionality?
• Impacts security?
• Breaking change?
• Includes tests?
• Includes documentation?

How This Was Tested

N/A

Integration Instructions

Consumers can now use validation.type = "guid" with a guild field of [a, b, c, [d0, d1, d2, d3, d4, d5, d6, d7]

[[rule]]
symbol = "MyGuid"
validation.type = "guid"
validation.content = [0x0, 0x0, 0x0, [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0]]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.51%. Comparing base (2074cbe) to head (d7d6d1e).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #474   +/-   ##
=====================================
  Coverage   0.51%   0.51%           
=====================================
  Files        143     143           
  Lines      20715   20715           
  Branches      60      60           
=====================================
  Hits         106     106           
  Misses     20604   20604           
  Partials       5       5           

Flag	Coverage Δ
MmSupervisorPkg	0.51% <ø> (ø)

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[makubacki]

Is this one you could add unit tests for? Endianness has been an occasional issue with GUIDs in the past.