feat: support set the order of the panel

[wewoor]

Overview

Support set the order of the PaneItem when adding a new one

Changes

• Add the sortIndex property for the PanelItem model
• Add the default sortIndex value for the OutputPanel and ProblemsPanel

[codecov]

Codecov Report

Merging #351 (769345c) into main (20ee544) will increase coverage by 0.01%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
+ Coverage   56.98%   56.99%   +0.01%     
==========================================
  Files         173      173              
  Lines        4640     4644       +4     
  Branches     1023     1024       +1     
==========================================
+ Hits         2644     2647       +3     
- Misses       1973     1974       +1     
  Partials       23       23              

Impacted Files	Coverage Δ
src/model/problems.tsx	100.00% <ø> (ø)
src/model/workbench/panel.tsx	100.00% <ø> (ø)
src/workbench/panel/panel.tsx	84.21% <75.00%> (-2.46%)	⬇️

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[mortalYoung]

+1