Fix issue with ML-DSA key parsing

[samuel40791765]

Issues:

Resolves P195558735

Description of changes:

This fixes a memory read misalignment in the ML-DSA public and private key parsing. I've also added new tests to verify that the test works. This should also fix the intermittent errors we've been having in our fuzz tests. The plan is to cut a release as soon as this is merged.

Call-outs:

N/A

Testing:

New 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

All modified and coverable lines are covered by tests ✅

Project coverage is 78.96%. Comparing base (7965343) to head (75a3282).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2152      +/-   ##
==========================================
- Coverage   78.97%   78.96%   -0.01%     
==========================================
  Files         611      611              
  Lines      105541   105551      +10     
  Branches    14950    14949       -1     
==========================================
- Hits        83353    83352       -1     
- Misses      21533    21546      +13     
+ Partials      655      653       -2     

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