This is a large refactor of the msgpack code

[schmidtw]

This refactor is designed to improve performance (30% fewer mallocs) as
well as improve code quality and resiliance.

[codecov]

Codecov Report

Merging #107 (81ecbf2) into main (9a9e172) will increase coverage by 7.05%.
The diff coverage is 95.37%.

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   87.30%   94.35%   +7.05%     
==========================================
  Files           6        6              
  Lines        1032      886     -146     
==========================================
- Hits          901      836      -65     
+ Misses        131       50      -81     

Impacted Files	Coverage Δ
src/wrp-c.c	94.20% <90.32%> (-1.43%)	⬇️
src/msgpack.c	95.60% <95.69%> (+12.61%)	⬆️
src/string.c	86.95% <0.00%> (-2.43%)	⬇️
src/utils.c	91.30% <0.00%> (-1.15%)	⬇️
src/b64.c	100.00% <0.00%> (ø)
src/locator.c	100.00% <0.00%> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

87.0% Coverage
0.0% Duplication