feat: support TreeView Drag API

[erha19]

Types

• 🎉 New Features

Background or solution

close #1402.

测试案例：https://github.com/microsoft/vscode-extension-samples/tree/drop-file-transfer

参考：microsoft/vscode#150321

Changelog

• support TreeView Drag API

[erha19]

预览效果：

Kapture.2022-10-10.at.22.33.45.mp4

测试插件：https://github.com/microsoft/vscode-extension-samples/tree/drop-file-transfer/tree-view-sample

[codecov]

Codecov Report

Base: 57.74% // Head: 57.59% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (f717b99) compared to base (9614240).
Patch coverage: 32.93% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1764      +/-   ##
==========================================
- Coverage   57.74%   57.59%   -0.16%     
==========================================
  Files        1280     1283       +3     
  Lines       79571    80041     +470     
  Branches    16659    16776     +117     
==========================================
+ Hits        45952    46099     +147     
- Misses      30590    30873     +283     
- Partials     3029     3069      +40     

Flag	Coverage Δ
jsdom	52.46% <32.93%> (-0.13%)	⬇️
node	15.80% <0.40%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ser/vscode/api/tree-view/tree-view.node.defined.ts	12.26% <0.00%> (ø)
.../src/hosted/api/vscode/ext.host.window.api.impl.ts	14.61% <0.00%> (ø)
...er/vscode/api/tree-view/tree-view.model.service.ts	21.29% <14.21%> (-4.93%)	⬇️
...kages/extension/src/common/vscode/data-transfer.ts	17.50% <17.50%> (ø)
packages/extension/src/common/vscode/ext-types.ts	50.17% <25.00%> (-0.52%)	⬇️
...extension/src/common/vscode/data-transfer-cache.ts	34.78% <34.78%> (ø)
...next/src/browser/services/file-tree-dnd.service.ts	69.33% <40.00%> (+0.14%)	⬆️
packages/extension/src/common/vscode/treeview.ts	48.00% <42.85%> (-27.00%)	⬇️
packages/extension/src/common/vscode/converter.ts	39.11% <44.82%> (+0.19%)	⬆️
...ion/src/browser/vscode/api/main.thread.treeview.ts	49.64% <58.13%> (+0.87%)	⬆️
... and 6 more

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[Ricbet]

LGTM