Add CBnT 2.1 and replace code generation in intel/metadata

[micgor32]

CBnT 2.1 (MTL and newer) brings breaking changes:

• PDRS and CNBS are now mandatory element of PCD (see d75ae02).
• SACM v5 moves the header to 0x00050004, given that the R/W methods for all SACM versions are same, the logic is moved out to the generic implementation (see 1800718, lines 357-377).
• BPM header is > 0x21, thus 0x22 to 0x25 is recognized as BootGuardVersion.Version21.

Replace codegen for manifest/structure methods. This is done by moving out the logic to a dedicated struct (Common), that is then embed into the remaining structs. These have to provide their layout descriptor on each call to Common. This reduces the amount of the code in general in the intel/metadata. Additionally, bg and cbnt are now merged by letting the per-type constructor to return the correct type implementation. Both concepts are documented in pkg/intel/metadata/README.md in 5903d58.

Since the amount of (+- lines) changes is huge, I've tried to split commits into one per type + the unit test for it. There are few types that are just moved from either bg or cbnt, and contribute to the modified lines, but do not contain any meaningful logic change. I've noted such cases in the commit description.

Renamed common/unittest to common/integration to avoid confusion with the purpose of it and *_test.go in cbnt. The integration test is now extended a bit, and its full scope is document in pkg/intel/metadata/common/integration/README.md in c96a8bd.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 58.61942% with 1121 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.76%. Comparing base (5620ca1) to head (7ce450a).

Files with missing lines	Patch %	Lines
pkg/intel/metadata/cbnt/bootpolicy/manifest.go	43.47%	316 Missing and 61 partials ⚠️
pkg/intel/metadata/cbnt/bootpolicy/se.go	54.94%	151 Missing and 22 partials ⚠️
pkg/intel/metadata/cbnt/bootpolicy/pcd.go	54.31%	89 Missing and 17 partials ⚠️
pkg/intel/metadata/cbnt/bootpolicy/pm.go	28.44%	80 Missing and 3 partials ⚠️
...g/intel/metadata/cbnt/keymanifest/manifest_cbnt.go	63.58%	45 Missing and 14 partials ⚠️
pkg/intel/metadata/cbnt/common.go	68.36%	29 Missing and 27 partials ⚠️
pkg/intel/metadata/cbnt/bootpolicy/txt.go	54.78%	48 Missing and 4 partials ⚠️
pkg/intel/metadata/cbnt/bootpolicy/bpmh.go	74.14%	29 Missing and 9 partials ⚠️
pkg/intel/metadata/cbnt/keymanifest/manifest_bg.go	53.52%	27 Missing and 6 partials ⚠️
pkg/intel/metadata/cbnt/keymanifest/hash.go	56.16%	28 Missing and 4 partials ⚠️
... and 11 more
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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #450       +/-   ##
===========================================
+ Coverage   34.13%   44.76%   +10.62%     
===========================================
  Files         209      170       -39     
  Lines       14120    12243     -1877     
===========================================
+ Hits         4820     5480      +660     
+ Misses       8411     5939     -2472     
+ Partials      889      824       -65     

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[micgor32]

ping @orangecms, @rminnich

[orangecms]

ping @orangecms, @rminnich

seen it! It's a bit of a change... :D
Not sure when I can finf the time to review this thoroughly.

I would also want to port the general logic and structs to
https://github.com/platform-system-interface/intel_fw