Conditionally set dataset per-event based on :service.name

[drewinglis]

Follow the OTEL spec and set the dataset per-event based on the :service.name property, if it's present.

[codecov-commenter]

Codecov Report

Patch coverage: 6.06% and project coverage change: -9.52% ⚠️

Comparison is base (d1210dd) 44.89% compared to head (136e133) 35.38%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   44.89%   35.38%   -9.52%     
==========================================
  Files           1        1              
  Lines          98      130      +32     
  Branches        0        1       +1     
==========================================
+ Hits           44       46       +2     
- Misses         54       83      +29     
- Partials        0        1       +1     

Files Changed	Coverage Δ
src/ken/honeycomb.clj	35.38% <6.06%> (-9.52%)	⬇️

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