Adds a script to retrieve the extensions from this repository

Author: arcanis

package.json

@@ -57,6 +57,7 @@
     "build:plugin-workspace-tools": "yarn node -r ./scripts/setup-ts-execution ./scripts/create-mock-plugin.ts workspace-tools",
     "build:plugin-commands": "node ./scripts/gen-plugin-commands.js > packages/yarnpkg-cli/sources/pluginCommands.ts",
     "build:compile": "rm -rf \"$0\"/lib && mkdir -p \"$0\"/lib && rsync -a --include '*.d.ts' --exclude '*.ts' --exclude '*.tsx' \"$0\"/sources/ \"$0\"/lib/ && node scripts/compile \"$@\"",
+    "dump:extensions": "yarn node -r ./scripts/setup-ts-execution -p 'JSON.stringify(require(\"./packages/yarnpkg-extensions/sources/index.ts\").packageExtensions)'",
     "test:lint": "eslint --max-warnings 0 .",
     "test:unit": "jest",
     "typecheck:all": "tsc -p ."