cmd: add jaeger service name flag

[corverroos]

Adds a --jaeger-service flag to override jager service name in simnet. Also add support for deterministic duty rooted spans.

category: feature
ticket: #302

[codecov]

Codecov Report

Merging #303 (148575e) into main (1de96c5) will increase coverage by 0.04%.
The diff coverage is 43.24%.

@@            Coverage Diff             @@
##             main     #303      +/-   ##
==========================================
+ Coverage   55.95%   56.00%   +0.04%     
==========================================
  Files          57       57              
  Lines        4459     4491      +32     
==========================================
+ Hits         2495     2515      +20     
- Misses       1625     1637      +12     
  Partials      339      339              

Impacted Files	Coverage Δ
app/tracer/trace.go	47.14% <15.78%> (-12.86%)	⬇️
core/types.go	40.00% <61.53%> (+18.94%)	⬆️
app/app.go	62.33% <100.00%> (+0.38%)	⬆️
cmd/run.go	100.00% <100.00%> (ø)

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[dB2510]

LGTM