Optimize Pv4 Data Resource class

[Thirumalai-Nambi-S]

Optimized Pv4 Data Resource Class

What’s improved:

1. Cached default config path:

   • The path to 'pv4_config.json' is computed only once using lru_cache.

   • Avoids repeated calls to os.path.abspath and os.path.dirname
     when multiple Pv4 instances are created.

2. Cleaner fallback logic:

   • Uses Pythonic 'data_config or default' pattern instead of explicit condition.

3. Proper kwargs forwarding:

   • Ensures any additional filesystem arguments (**kwargs) are passed
     to the parent class (important for fsspec configurations like authentication, caching, etc.)