WIP: Feature/error indicator

[imaNNeo]

In this PR, I'm gonna add error indicator range feature in our axis-based charts.

This work is sponsored by Intero The Sniffers

Fixes #1483

• Infrastructure
• LineChart (sample 13)
• BarChart (sample 8)
• ScatterChart
• Cleanup
• Documentation
• Unit-Tests

[codecov]

Codecov Report

Attention: Patch coverage is 58.02469% with 34 lines in your changes missing coverage. Please review.

Project coverage is 92.51%. Comparing base (b1699fd) to head (d090994).
Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/chart/bar_chart/bar_chart_painter.dart	37.93%	18 Missing ⚠️
...src/chart/scatter_chart/scatter_chart_painter.dart	50.00%	12 Missing ⚠️
lib/src/chart/line_chart/line_chart_painter.dart	92.30%	2 Missing ⚠️
lib/src/utils/canvas_wrapper.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1842      +/-   ##
==========================================
- Coverage   93.38%   92.51%   -0.88%     
==========================================
  Files          46       46              
  Lines        3267     3341      +74     
==========================================
+ Hits         3051     3091      +40     
- Misses        216      250      +34     

Flag	Coverage Δ
flutter	92.51% <58.02%> (-0.88%)	⬇️

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[imaNNeo]

CleanShot.2025-01-08.at.23.45.35.mp4

[imaNNeo]

CleanShot.2025-01-09.at.01.07.44.mp4

[imaNNeo]

crossAlignment property

CleanShot.2025-01-09.at.01.51.35.mp4

[imaNNeo]

Lower and upper text values

CleanShot.2025-01-10.at.23.26.33.mp4

[imaNNeo]

Implemented in Bar Chart:

[imaNNeo]

Implemented in Scatter Chart

CleanShot.2025-01-11.at.01.11.07.mp4