Add back SSL_use_certificate_chain_file

[samuel40791765]

Issues:

Addresses CryptoAlg-2165

Description of changes:

Librelp consumes this so we have to add it back. I translated the underlying function to C++ while I was at it. The function (like it's OpenSSL version) has some SSL_CTX and SSL specific logic, so there needs to be a way to differentiate.

Call-outs:

N/A

Testing:

New test for SSL_use_certificate_chain_file and SSL_CTX_use_certificate_chain_file.

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: 8 lines in your changes are missing coverage. Please review.

Comparison is base (b15b9d3) 77.96% compared to head (ca98931) 76.45%.
Report is 16 commits behind head on main.

Files	Patch %	Lines
ssl/ssl_file.cc	77.77%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1312      +/-   ##
==========================================
- Coverage   77.96%   76.45%   -1.51%     
==========================================
  Files         530      421     -109     
  Lines      101077    70989   -30088     
==========================================
- Hits        78805    54278   -24527     
+ Misses      22272    16711    -5561     

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