Feature : Batch Processing Support

[Soumyals]

Currently endpoint processes one text at a time, requiring multiple HTTP calls for bulk sentiment analysis.

Proposed Solution:
Extend the endpoint to accept an array of texts in a single request.
Return aggregated results with the same order as input.

It improves performance, reduces HTTP overhead, and simplifies client-side integration. The update will maintain backward compatibility with single-text requests and include unit and integration tests to ensure reliability.