New property PieChartData.titleSunbeamLayout to rotate the titles of each section of the chart

[herna]

The idea is taken from the following library, property labelSunbeamLayout: https://krispo.github.io/angular-nvd3/#/pieChart

You can set the property titleSunbeamLayout in PieChartData to rotate the titles.

By default is set to false to not modify any existing code:

By if you set it true it'll look like this:

This is specially useful for large sets of data where titles can easily overlap.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 86.29%. Comparing base (2ff658b) to head (3f8fa49).
Report is 25 commits behind head on main.

❗ Current head 3f8fa49 differs from pull request most recent head 20a266f. Consider uploading reports for the commit 20a266f to get more accurate results

Files	Patch %	Lines
lib/src/chart/pie_chart/pie_chart_painter.dart	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1582      +/-   ##
==========================================
- Coverage   86.38%   86.29%   -0.09%     
==========================================
  Files          45       45              
  Lines        3047     3051       +4     
==========================================
+ Hits         2632     2633       +1     
- Misses        415      418       +3     

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[imaNNeo]

It is a nice feature.
Thank you so much
btw, there is an issue, I think the pointed value should be upside down.

[imaNNeo]

Also, you need to write some unit-tests
Follow the contributing guideline:
https://github.com/imaNNeo/fl_chart/blob/main/CONTRIBUTING.md

[herna]

I made a typo on the upper limit to rotate the title, well-trained eye 😃

I also wrote some unit tests and made some other minor adjustments, let's see now.

[imaNNeo]

Thank you so much!
It's approved and ready to be merged.
Just a minor thing to do, can you please update the pie_chart.md documentation to add the new property?

[herna]

Done @imaNNeo

[imaNNeo]

Thanks for your contribution!