Add CYAML_BINARY type

[tlsa]

Add support for Base64-encoded binary data.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.91667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.23%. Comparing base (2eccbea) to head (908a3f4).

Files	Patch %	Lines
src/base64.c	95.34%	0 Missing and 4 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   97.17%   97.23%   +0.06%     
==========================================
  Files          10       11       +1     
  Lines        2090     2281     +191     
  Branches      455      497      +42     
==========================================
+ Hits         2031     2218     +187     
  Misses         28       28              
- Partials       31       35       +4     

Flag	Coverage Δ
unittests	97.23% <97.91%> (+0.06%)	:arrow_up:

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