Support for AES 192

[justsmth]

Issues:

Addresses: CryptoAlg-2678

Description of changes:

Add support for AES-192:

• aead::AES_192_GCM
• cipher::AES_192: CTR, CBC, ECB and CFB modes

Testing:

• The AES_192_GCM tests use the NIST KATs
• For cipher, test KAT values obtained from invoking same operation in OpenSSL.

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: Patch coverage is 88.88889% with 10 lines in your changes missing coverage. Please review.

Project coverage is 92.77%. Comparing base (c358484) to head (ef727c3).
Report is 127 commits behind head on main.

Files with missing lines	Patch %	Lines
aws-lc-rs/src/cipher/key.rs	76.47%	5 Missing and 3 partials ⚠️
aws-lc-rs/src/aead/quic.rs	66.66%	1 Missing ⚠️
aws-lc-rs/src/aead/unbound_key.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #622      +/-   ##
==========================================
- Coverage   95.80%   92.77%   -3.03%     
==========================================
  Files          61       67       +6     
  Lines        8143     9879    +1736     
  Branches        0     9879    +9879     
==========================================
+ Hits         7801     9165    +1364     
- Misses        342      428      +86     
- Partials        0      286     +286     

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[samuel40791765]

LGTM; double checked that we weren't exposing AES-192 for TLS since there aren't any existing ciphers using it.