Implement From<&PublicKey> for PublicKeyComponents

[djc]

Issues:

Addresses #697

Description of changes:

Add conversion from &PublicKey to PublicKeyComponents<&[u8]>. Seems pretty straightforward?

(I looked at the minor issue as well, but I'm not sure how to compute the correct public_modulus_len() from the decomposed modulus.)

Testing:

No tests yet -- let me know if/where I should add some test coverage.

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 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 92.87%. Comparing base (c358484) to head (6408d4d).
Report is 169 commits behind head on main.

Files with missing lines	Patch %	Lines
aws-lc-rs/src/rsa/key.rs	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #698      +/-   ##
==========================================
- Coverage   95.80%   92.87%   -2.93%     
==========================================
  Files          61       70       +9     
  Lines        8143     9517    +1374     
  Branches        0     9517    +9517     
==========================================
+ Hits         7801     8839    +1038     
- Misses        342      412      +70     
- Partials        0      266     +266     

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