Feature/scatter customizable spot

[imaNNeo]

• IMPROVEMENT (by @imaNNeo) Add dotPainter property to ScatterSpot to allow customizing the dot painter, Placing an Icon inside / over a ScatterSpot #568
• BREAKING (by @imaNNeo) Remove color and radius properties from ScatterSpot (use dotPainter instead), Placing an Icon inside / over a ScatterSpot #568
• BREAKING (by @imaNNeo) Change the default value of FlDotCirclePainter.strokeWidth to 0.0

/// Migration guide:
/// This is the old way:
ScatterSpot(
  2,
  5,
  color: Colors.red,
  radius: 12,
)

/// This is the new way:
ScatterSpot(
  2,
  8,
  dotPainter: FlDotCirclePainter(
    color: Colors.red,
    radius: 22,
  ),
),

Screen.Recording.2023-12-03.at.21.49.10.mov

[docs-page]

To view this pull requests documentation preview, visit the following URL:

docs.page/imanneo/fl_chart~1519

Documentation is deployed and generated using docs.page.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6b52a4e) 86.70% compared to head (b54632a) 86.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1519   +/-   ##
=======================================
  Coverage   86.70%   86.71%           
=======================================
  Files          45       45           
  Lines        3024     3018    -6     
=======================================
- Hits         2622     2617    -5     
+ Misses        402      401    -1     

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