Adding internal functions for ML-DSA

[jakemas]

Issues:

Resolves #CryptoAlg-2723

Description of changes:

Adding the internal functions as defined in FIPS 204:

• Algorithm 6 ML-DSA.KeyGen_internal
• Algorithm 7 ML-DSA.Sign_internal
• Algorithm 8 ML-DSA.Verify_internal

The re-write of Algorithm 7 and 8 is now consistent with upstream pq-crystals/dilithium@444cdcc.

Call-outs:

Upstream has no implementation of Algorithm 6 ML-DSA.KeyGen_internal, so this is AWS-LC specific.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 78.77%. Comparing base (a11d73c) to head (8e2a69e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1977      +/-   ##
==========================================
+ Coverage   78.75%   78.77%   +0.02%     
==========================================
  Files         590      590              
  Lines      101482   101506      +24     
  Branches    14397    14400       +3     
==========================================
+ Hits        79920    79964      +44     
+ Misses      20928    20907      -21     
- Partials      634      635       +1     

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[jakemas]

See #1999