feat(binding_mqtt): support MQTT URI scheme

[JKRhb]

This PR adds support for the use of the MQTT URI scheme that is currently being discussed in w3c/wot-binding-templates#292.

An open question here is how to deal with the topic vocabulary term. With the implementation in this PR, it is being treated as an "override", but maybe it also becomes obsolete when the new URI scheme is in place.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -8.25% ⚠️

Comparison is base (1fd9a64) 60.41% compared to head (d8e8744) 52.16%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   60.41%   52.16%   -8.25%     
==========================================
  Files          70       70              
  Lines        2185     2189       +4     
==========================================
- Hits         1320     1142     -178     
- Misses        865     1047     +182     

Files Changed	Coverage Δ
lib/src/binding_mqtt/mqtt_extensions.dart	0.00% <0.00%> (ø)

... and 16 files with indirect coverage changes

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.22%. Comparing base (fc3d0a6) to head (47a23d3).
⚠️ Report is 74 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/binding_mqtt/mqtt_extensions.dart	0.00%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   63.34%   63.22%   -0.12%     
==========================================
  Files          78       78              
  Lines        2275     2279       +4     
==========================================
  Hits         1441     1441              
- Misses        834      838       +4     

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