fix: can't add the new panel when open it

[wewoor]

Overview

使用 PanelService.open 方法，可以直接添加不存在的面板对象

Fixes #388

Changes

• 调用 open 时，如果是不存在的 Panel 项，执行 add 操作，在设置为 current

How Has This Been Tested?

• 已补充 open 单元测试用例

[codecov]

Codecov Report

Merging #390 (611a673) into main (6bb6605) will increase coverage by 1.81%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #390      +/-   ##
==========================================
+ Coverage   73.35%   75.17%   +1.81%     
==========================================
  Files         176      176              
  Lines        4797     4806       +9     
  Branches     1033     1036       +3     
==========================================
+ Hits         3519     3613      +94     
+ Misses       1270     1185      -85     
  Partials        8        8              

Impacted Files	Coverage Δ
src/services/workbench/panelService.ts	98.76% <100.00%> (+0.03%)	⬆️
test/utils.ts	100.00% <0.00%> (ø)
src/services/helper.ts	100.00% <0.00%> (ø)
src/workbench/menuBar/menuBar.tsx	87.50% <0.00%> (ø)
...c/services/workbench/explorer/editorTreeService.ts	100.00% <0.00%> (ø)
...c/services/workbench/explorer/folderTreeService.ts	96.49% <0.00%> (+80.45%)	⬆️

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[mortalYoung]

+1