Add LoongArch64 support for Platform-specific extensions

[realybin]

Currently, VSCode's platform-specific extensions support various targets but lacks support for the LoongArch64 architecture. This limits the distribution capabilities for extensions targeting this emerging platform.

vscode-vsce/src/package.ts

Lines 453 to 464 in 06951d9

	export const Targets = new Set([
	'win32-x64',
	'win32-arm64',
	'linux-x64',
	'linux-arm64',
	'linux-armhf',
	'darwin-x64',
	'darwin-arm64',
	'alpine-x64',
	'alpine-arm64',
	'web',
	]);

Current situation:

• LoongArch64 is a new architecture gaining adoption (see benchmarks and support status on Phoronix: https://www.phoronix.com/search/LoongArch)
• The current supported platforms are: win32-x64, win32-arm64, linux-x64, linux-arm64, linux-armhf, alpine-x64, alpine-arm64, darwin-x64, darwin-arm64 and web
• Unable to access source code of npm @vscode/vsce-sign to implement support
  

  vscode-vsce/package-lock.json

  Lines 706 to 722 in 06951d9

  	"node_modules/@vscode/vsce-sign": {
  	"version": "2.0.3",
  	"resolved": "https://registry.npmjs.org/@vscode/vsce-sign/-/vsce-sign-2.0.3.tgz",
  	"integrity": "sha512-NYktTVXYIjJ41CTfImuWLYSw2UoZwYYFk7VcVYTjTZnD7NnuaM3DizaFZfuRG5YMRT/oZa1t1d4bwzrBALR3VQ==",
  	"hasInstallScript": true,
  	"optionalDependencies": {
  	"@vscode/vsce-sign-alpine-arm64": "2.0.1",
  	"@vscode/vsce-sign-alpine-x64": "2.0.1",
  	"@vscode/vsce-sign-darwin-arm64": "2.0.1",
  	"@vscode/vsce-sign-darwin-x64": "2.0.1",
  	"@vscode/vsce-sign-linux-arm": "2.0.1",
  	"@vscode/vsce-sign-linux-arm64": "2.0.1",
  	"@vscode/vsce-sign-linux-x64": "2.0.1",
  	"@vscode/vsce-sign-win32-arm64": "2.0.1",
  	"@vscode/vsce-sign-win32-x64": "2.0.1"
  	}
  	},

Feature request:

1. Add loongarch64 as a supported target platform for VSCode extensions
2. Enable the --target flag to support loongarch64 platform specification
3. Update relevant documentation to include the new target platform

While most extensions are platform-agnostic, having proper platform-specific packaging support would greatly improve distribution capabilities for the LoongArch64 ecosystem.

Would it be possible to add this support in a future release? Thanks

I can make pull request