feat: speed up marshalling messages

[bdraco]

Enums never change, only resolve them once

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.00%. Comparing base (89026e3) to head (d133f1e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
+ Coverage   83.88%   84.00%   +0.12%     
==========================================
  Files          28       28              
  Lines        3381     3388       +7     
  Branches      607      607              
==========================================
+ Hits         2836     2846      +10     
+ Misses        338      334       -4     
- Partials      207      208       +1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #383 will improve performances by 4.12%

_{Comparing outgoing_message_values (d133f1e) with main (89026e3)}

Summary

⚡ 1 improvements
✅ 2 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_marshall_bluez_get_managed_objects_message	73 µs	70.1 µs	+4.12%