Add support for new StructTypes.CustomStruct trait

[quinnj]

No description provided.

[codecov]

Codecov Report

Merging #15 (a921dc3) into main (03ef999) will decrease coverage by 1.00%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   81.15%   80.14%   -1.01%     
==========================================
  Files           1        1              
  Lines         260      272      +12     
==========================================
+ Hits          211      218       +7     
- Misses         49       54       +5     

Impacted Files	Coverage Δ
src/Strapping.jl	80.14% <78.57%> (-1.01%)	⬇️

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