switch from jest to vitest

vitest.config.ts

@@ -0,0 +1,16 @@
+import {defineConfig} from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    setupFiles: ['./vitest.setup.ts'],
+    include: ['tests/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'clover', 'lcov'],
+      reportsDirectory: 'coverage',
+      include: ['src/**/*.ts'],
+      exclude: ['src/main.ts']
+    }
+  }
+});