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.

.gitignore

@@ -1,37 +1,37 @@
-# dependencies (bun install)
-node_modules
-
-# output
-out
-dist
-*.tgz
-
-# code coverage
-coverage
-*.lcov
-
-# logs
-logs
-_.log
-report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
-
-# dotenv environment variable files
-.env
-.env.development.local
-.env.test.local
-.env.production.local
-.env.local
-
-# caches
-.eslintcache
-.cache
-*.tsbuildinfo
-
-# IntelliJ based IDEs
-.idea
-
-# Finder (MacOS) folder config
-.DS_Store
-*.xlsx
-*.csv
-
+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
+*.xlsx
+*.csv
+