chore: add basic serialization tests for message fields

[enmand]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.12871% with 13 lines in your changes missing coverage. Please review.

Project coverage is 82.61%. Comparing base (b94a099) to head (1d33e40).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ates/dwn-rs-core/src/interfaces/messages/fields.rs	87.12%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
+ Coverage   81.52%   82.61%   +1.08%     
==========================================
  Files          22       22              
  Lines        1440     1553     +113     
==========================================
+ Hits         1174     1283     +109     
- Misses        266      270       +4     

Flag	Coverage Δ
	82.61% <87.12%> (+1.08%)	⬆️

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