AES Key Wrap Algorithm Support

[skmcgrail]

Description of changes:

Adds aws_lc_rs::key_wrap module that provides AES-128 and AES-256 key wrap algorithms (padded and unpadded variants).

Testing:

Pulled a partial set of key wrap tests from the available CAVP tests.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (fa6733a) 95.21% compared to head (50a0c43) 95.66%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
aws-lc-rs/src/key_wrap.rs	97.25%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #250      +/-   ##
==========================================
+ Coverage   95.21%   95.66%   +0.45%     
==========================================
  Files          55       57       +2     
  Lines        6980     7751     +771     
==========================================
+ Hits         6646     7415     +769     
- Misses        334      336       +2     

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[justsmth]

Looks good overall. I have a couple of questions we should consider before we finalize this as our "key wrap" API.