Refactor MqttError type

[fafhrd91]

No description provided.

[codecov]

Codecov Report

Patch coverage: 18.18% and project coverage change: -0.83% ⚠️

Comparison is base (f874e8b) 65.36% compared to head (f976188) 64.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
- Coverage   65.36%   64.54%   -0.83%     
==========================================
  Files          53       53              
  Lines        9289     9366      +77     
==========================================
- Hits         6072     6045      -27     
- Misses       3217     3321     +104     

Files Changed	Coverage Δ
src/error.rs	25.42% <0.00%> (-0.90%)	⬇️
src/server.rs	61.84% <0.00%> (-1.27%)	⬇️
src/types.rs	5.26% <0.00%> (-44.74%)	⬇️
src/v3/publish.rs	6.12% <0.00%> (ø)
src/v3/selector.rs	0.00% <0.00%> (ø)
src/v3/shared.rs	69.07% <0.00%> (-2.30%)	⬇️
src/v5/codec/codec.rs	68.70% <0.00%> (-3.96%)	⬇️
src/v5/selector.rs	0.00% <0.00%> (ø)
src/v5/shared.rs	69.50% <0.00%> (-1.77%)	⬇️
src/v3/server.rs	57.50% <7.14%> (-0.42%)	⬇️
... and 9 more

... and 2 files with indirect coverage changes

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