feat: improve incoming data processing performance

[bdraco]

• Make a few more classes that do not need dynamic attributes slotted

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f0577f0) 99.77% compared to head (6b2c3ba) 99.78%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1194   +/-   ##
=======================================
  Coverage   99.77%   99.78%           
=======================================
  Files          22       22           
  Lines        2721     2728    +7     
  Branches      474      474           
=======================================
+ Hits         2715     2722    +7     
  Misses          3        3           
  Partials        3        3           

Impacted Files	Coverage Δ
src/zeroconf/__init__.py	100.00% <100.00%> (ø)
src/zeroconf/_core.py	99.77% <100.00%> (+<0.01%)	⬆️
src/zeroconf/_services/__init__.py	100.00% <100.00%> (ø)
src/zeroconf/_services/browser.py	99.14% <100.00%> (+0.01%)	⬆️
src/zeroconf/_services/registry.py	100.00% <100.00%> (ø)

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