feat: support icons contribution point

[Aaaaash]

Types

• 🎉 New Features

Background or solution

Changelog

• 支持插件注册字体图标

[codecov]

Codecov Report

Base: 57.66% // Head: 57.64% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (20a7eb3) compared to base (dd06f9b).
Patch coverage: 47.36% of modified lines in pull request are covered.

❗ Current head 20a7eb3 differs from pull request most recent head 7e19843. Consider uploading reports for the commit 7e19843 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1880      +/-   ##
==========================================
- Coverage   57.66%   57.64%   -0.03%     
==========================================
  Files        1284     1284              
  Lines       80403    80458      +55     
  Branches    16826    16842      +16     
==========================================
+ Hits        46368    46381      +13     
- Misses      30958    30994      +36     
- Partials     3077     3083       +6     

Flag	Coverage Δ
jsdom	52.40% <47.36%> (-0.02%)	⬇️
node	15.88% <0.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...s/extension/src/browser/vscode/contributes/icon.ts	50.98% <45.94%> (-15.69%)	⬇️
.../extension/src/browser/vscode/contributes/index.ts	100.00% <100.00%> (ø)
...ages/file-service/src/node/file-service-watcher.ts	77.84% <0.00%> (-2.28%)	⬇️
...ension/src/browser/vscode/api/main.thread.tests.ts	16.32% <0.00%> (-0.53%)	⬇️
.../extension/src/hosted/api/vscode/ext.host.tests.ts	6.03% <0.00%> (-0.10%)	⬇️
packages/extension/src/common/vscode/converter.ts	39.02% <0.00%> (-0.10%)	⬇️
packages/core-browser/src/core-preferences.ts	92.30% <0.00%> (ø)
packages/core-browser/src/contextkey/testing.ts	0.00% <0.00%> (ø)
...ackages/components/src/recycle-tree/basic/types.ts	100.00% <0.00%> (ø)
...ges/extension/src/common/vscode/testing/testApi.ts	14.28% <0.00%> (ø)

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