[DRAFT] ParsedPublicKey for signature and agreement

[justsmth]

Issues:

Addresses #849

Description of changes:

TODO

Call-outs:

TODO

Testing:

TODO

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

❌ Patch coverage is 43.58974% with 154 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.96%. Comparing base (c358484) to head (e0f1bb2).
⚠️ Report is 239 commits behind head on main.

Files with missing lines	Patch %	Lines
aws-lc-rs/src/signature.rs	11.66%	53 Missing ⚠️
aws-lc-rs/src/rsa/signature.rs	0.00%	29 Missing ⚠️
aws-lc-rs/src/ed25519.rs	12.50%	20 Missing and 1 partial ⚠️
aws-lc-rs/src/ec/signature.rs	60.86%	16 Missing and 2 partials ⚠️
aws-lc-rs/src/pqdsa/signature.rs	0.00%	18 Missing ⚠️
aws-lc-rs/src/agreement.rs	89.85%	6 Missing and 1 partial ⚠️
aws-lc-rs/src/evp_pkey.rs	76.19%	4 Missing and 1 partial ⚠️
aws-lc-rs/src/rsa/key.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
- Coverage   95.80%   90.96%   -4.84%     
==========================================
  Files          61       71      +10     
  Lines        8143     9478    +1335     
  Branches        0     9478    +9478     
==========================================
+ Hits         7801     8622     +821     
- Misses        342      576     +234     
- Partials        0      280     +280     

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