profiles: add JFR data export example

[jhalliday]

Sample code for converting and exporting JFR ExecutionSample events using OTLP profiles signal.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.30%. Comparing base (3ce641a) to head (8b9b62a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8207   +/-   ##
=========================================
  Coverage     90.30%   90.30%           
  Complexity     7652     7652           
=========================================
  Files           843      843           
  Lines         23066    23066           
  Branches       2310     2310           
=========================================
  Hits          20829    20829           
  Misses         1517     1517           
  Partials        720      720           

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