feat(data-point): create tracing api

[acatl]

What:

closes #416

Checklist:

• Has Breaking changes
• Documentation
• Tests
• Ready to be merged
• Added username to all-contributors list

[codecov]

Codecov Report

Merging #417 into canary will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           canary   #417   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          25     27    +2     
  Lines         424    457   +33     
  Branches       65     70    +5     
=====================================
+ Hits          424    457   +33

Impacted Files	Coverage Δ
packages/data-point/src/DataPoint.js	100% <100%> (ø)	⬆️
packages/data-point/src/ReducerEntity.js	100% <100%> (ø)	⬆️
packages/data-point/src/resolve.js	100% <100%> (ø)	⬆️
packages/data-point/src/tracing/Span.js	100% <100%> (ø)
packages/data-point/src/tracing/trace-span.js	100% <100%> (ø)
packages/data-point/src/tracing/Tracer.js	100% <100%> (ø)

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