chore(ci): set test coverage thresholds

Author: gregfromstl

packages/thirdweb/test/vitest.config.ts

@@ -30,6 +30,12 @@ export default defineConfig({
         "src/exports/**",
       ],
       include: ["src/**"],
+      thresholds: {
+        functions: 90,
+        branches: 80,
+        lines: 80,
+        statements: 80,
+      },
     },
     environmentMatchGlobs: [["src/react/**/*.test.tsx", "happy-dom"]],
     environment: "node",