More flexible API for AWS LC cipher suite

[mulmarta]

Allows to make custom cipher suites.

Testing:

How is this change tested (unit tests, fuzz tests, etc.)? Are there any testing steps to be verified by the reviewer?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.48649% with 10 lines in your changes missing coverage. Please review.

Project coverage is 90.21%. Comparing base (539cc5c) to head (10425c5).

Files with missing lines	Patch %	Lines
mls-rs-crypto-awslc/src/lib.rs	86.48%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
+ Coverage   90.19%   90.21%   +0.01%     
==========================================
  Files         180      180              
  Lines       32301    32375      +74     
==========================================
+ Hits        29134    29206      +72     
- Misses       3167     3169       +2     

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