feat: Add reranking functionality to Jina client

- Added a new `rerank` function to the Jina client for reranking documents.
- Added a new `RerankParams` struct to define parameters for reranking.
- Added unit tests for the new `rerank` function.
- Updated the example script to demonstrate reranking.
- Improved error handling and added more comprehensive logging.

examples/clients/jina.vsh

@@ -11,3 +11,12 @@ embeddings := jina_client.create_embeddings(
 ) or { panic('Error while creating embeddings: ${err}') }
 
 println('Created embeddings: ${embeddings}')
+
+rerank_result := jina_client.rerank(
+	model:     .reranker_v2_base_multilingual
+	query:     'skincare products'
+	documents: ['Product A', 'Product B', 'Product C']
+	top_n:     2
+) or { panic('Error while reranking: ${err}') }
+
+println('Rerank result: ${rerank_result}')