test: add bun workspace tests

examples/workspace/packages/pkg-a/index.ts

@@ -0,0 +1,3 @@
+export function workspaceMessage(): string {
+  return "workspace-pkg-a";
+}

examples/workspace/packages/pkg-a/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "@workspace/pkg-a",
+  "version": "1.0.0",
+  "main": "index.ts",
+  "dependencies": {
+    "lodash": "catalog:"
+  }
+}