fix: floating bar extra data preservation

[artus9033]

Describe your changes

This PR introduces changes requested by the community in #81, allowing for preservation of extra data in data points of array shape (floating bar). Although these are not supported officially in chart.js documentation, since the original issue mentioned the need for such support and chart.js code also seems to operate only on indices, not blocking extending the size of this data point shape, the code style may be adjusted to not interfere with the shape of array data points.

Closes #81.

Linked issues (if any)

• Extra data being removed for the range bar #81

Checklist before requesting a review

• E2E tests' snapshots (screenshots) are up-to-date
• documentation is up-to-date

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.75%. Comparing base (429643c) to head (8695759).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
+ Coverage   78.64%   78.75%   +0.11%     
==========================================
  Files           1        1              
  Lines         192      193       +1     
  Branches       78       78              
==========================================
+ Hits          151      152       +1     
  Misses         41       41              

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