Refactor SP-API test script and improve type definitions

- Updated `sp-test.ts` to enhance argument parsing and error handling for sellability checks.
- Refactored `types.ts` to maintain consistent formatting and improve readability.
- Improved `writer.ts` for better result handling and CSV writing, ensuring clarity in output.
- Adjusted `tsconfig.json` formatting for consistency and readability.

package.json

@@ -1,17 +1,17 @@
-{
-  "name": "asin-check",
-  "module": "src/index.ts",
-  "type": "module",
-  "private": true,
-  "devDependencies": {
-    "@types/bun": "latest"
-  },
-  "peerDependencies": {
-    "typescript": "^5"
-  },
-  "dependencies": {
-    "amazon-sp-api": "^1.2.1",
-    "ioredis": "^5.10.1",
-    "xlsx": "^0.18.5"
-  }
-}
+{
+  "name": "asin-check",
+  "module": "src/index.ts",
+  "type": "module",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "amazon-sp-api": "^1.2.1",
+    "ioredis": "^5.10.1",
+    "xlsx": "^0.18.5"
+  }
+}