feat: add optimized reader for uint16

[bdraco]

This is a 14% speed up processing ManufacturerData

[codecov]

Codecov Report

Base: 81.34% // Head: 81.50% // Increases project coverage by +0.15% 🎉

Coverage data is based on head (50992f5) compared to base (5b32072).
Patch coverage: 92.10% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
+ Coverage   81.34%   81.50%   +0.15%     
==========================================
  Files          27       27              
  Lines        3024     3050      +26     
  Branches      582      587       +5     
==========================================
+ Hits         2460     2486      +26     
+ Misses        349      343       -6     
- Partials      215      221       +6     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/_private/unmarshaller.py	94.31% <94.59%> (-0.20%)	⬇️
src/dbus_fast/message_bus.py	71.00% <0.00%> (-0.38%)	⬇️
src/dbus_fast/signature.py	58.95% <0.00%> (+1.74%)	⬆️

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