chore: add project configuration files

- Add package.json with extension metadata and dependencies
- Add tsconfig.json for TypeScript compilation
- Add .eslintrc.json for code linting
- Add .vscodeignore for packaging exclusions

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tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "ES2020",
+    "outDir": "out",
+    "lib": [
+      "ES2020"
+    ],
+    "sourceMap": true,
+    "rootDir": "src",
+    "strict": true,
+    "types": ["node", "vscode"]
+  },
+  "exclude": [
+    "node_modules",
+    ".vscode-test"
+  ]
+}