fix: Added fix to encode documents within rolling window

[mesax1]

fix: BadRequestError: Error code: 400 - {'error': {'message': "'$.input' is invalid. Please check the API reference: https://platform.openai.com/docs/api-reference.", 'type': 'invalid_request_error', 'param': None, 'code': None}}

Occurs when _encode_documents attempts to run splitter(docs), and len(docs)>2048, as it's an OpenAI limit when generating embeddings of an array.

How it fixes the problem:
Split the array into multiple arrays when len(docs)>2000, and sends the multiple arrays to generate the embeddings.

[github-actions]

Failed to generate code suggestions for PR

[simjak]

@mesax1 looks good to me, just some checks are failing

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 80.95%. Comparing base (302fe17) to head (3b78805).

Files	Patch %	Lines
semantic_router/splitters/rolling_window.py	0.00%	11 Missing ⚠️
semantic_router/index/pinecone.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
+ Coverage   80.78%   80.95%   +0.16%     
==========================================
  Files          44       44              
  Lines        2389     2399      +10     
==========================================
+ Hits         1930     1942      +12     
+ Misses        459      457       -2     

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