Add React webview architecture with pnpm workspaces (#761) #1887

Job	Run time
Lint	1m 5s
Unit Test (Electron latest)	58s
Unit Test (Electron 32)	58s
Integration Test (VS Code 1.95.0)	1m 20s
Integration Test (VS Code stable)	1m 10s
Package	25s
	5m 56s

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