Add SSL_CTX_use_cert_and_key

[smittals2]

Issues:

CryptoAlg-2863

Description of changes:

Adds the function SSL_CTX_use_cert_and_key which sets the leaf, chain, and private key all in one operation. This function is also needed by librdkafka.

Call-outs:

Point out areas that need special attention or support during the review process. Discuss architecture or design changes.

Testing:

Tests using this API to set the relevant fields and ensure TLS connection succeeds.

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 85.48387% with 9 lines in your changes missing coverage. Please review.

Project coverage is 78.95%. Comparing base (695c3a0) to head (3ecfb98).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
ssl/ssl_cert.cc	79.54%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2163      +/-   ##
==========================================
- Coverage   78.96%   78.95%   -0.01%     
==========================================
  Files         611      611              
  Lines      105514   105610      +96     
  Branches    14941    14959      +18     
==========================================
+ Hits        83319    83389      +70     
- Misses      21543    21568      +25     
- Partials      652      653       +1     

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