Implement legacy callback with BIO_set_callback

[kingstjo]

Issues:

Addresses #CRYPTOALG-3030

Description of changes:

Adds legacy callback to BIO meeting previous application compatibility.
Router function implemented to prefer enhanced callback but provide legacy callback if needed and available.

Call-outs:

We now check if callback is NULL after checking if we have a callback.
Rather than calling enhanced callback directly we check with router function get_callback

Testing:

Updated parameters for BIOPairTest to include boolean pairs enabling current enhanced callback testing to test for legacy callback.
Changed multiple tests from BIOTest to BIOPairTest for parameterized testing.
Will be adding test for get_callback in future PR

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 95.68966% with 5 lines in your changes missing coverage. Please review.

Project coverage is 79.05%. Comparing base (652f7a9) to head (18362cd).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
crypto/bio/bio.c	93.42%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2285      +/-   ##
==========================================
+ Coverage   79.02%   79.05%   +0.03%     
==========================================
  Files         614      614              
  Lines      106934   107103     +169     
  Branches    15145    15178      +33     
==========================================
+ Hits        84504    84675     +171     
+ Misses      21777    21775       -2     
  Partials      653      653              

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