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refactor: use pointers for blocklists throughout

Switch from passing `blocklist.BlockList` by value to
`*blocklist.BlockList` to ensure consistent state management, avoid
unnecessary copying, and improve memory efficiency.

- Updated `BlockList` structs to hold `lastUpdated` pointer.
- Standardized `ScannerFunc` for file processing.
- Refactored `BlockList` methods to utilize pointer receivers
consistently.

```mermaid
graph TD
    A[App/Dispatcher] -->|Manages| B(Slice of Pointers)
    B --> C[BlockList 0]
    B --> D[BlockList N]
    C -->|Shared State| E[Bloom Filter]
    C -->|Shared State| F[LastUpdated Time]
```