feat(data-point): Define accumulator.locals with a plain object

[raingerber]

What: Define accumulator.locals with a plain object

Why: Just to simplify the code a bit.

How: Removes the Locals function and uses a plain object instead.

Checklist:

• Has Breaking changes
• Documentation
• Tests
• Ready to be merged

[codecov]

Codecov Report

Merging #254 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #254   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         129    128    -1     
  Lines        1704   1698    -6     
  Branches      144    144           
=====================================
- Hits         1704   1698    -6

Impacted Files	Coverage Δ
packages/data-point/lib/accumulator/factory.js	100% <100%> (ø)	⬆️

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