Refactor retrieve_relevant function in chunks_service.py

[sweep-nightly[bot]]

Description

This PR refactors the retrieve_relevant function in chunks_service.py to improve modularity and readability. The function was quite large and complex, so it has been broken down into smaller subfunctions to reduce complexity. Additionally, unit tests have been added to ensure the correctness of the refactored code.

Summary of Changes

• Extracted code that creates the VectorStoreIndex and the vector_index_retriever into a new function named create_index_and_retriever.
• Extracted code that retrieves and sorts the nodes into a new function named retrieve_and_sort_nodes.
• Extracted code that constructs the list of Chunk objects into a new function named construct_chunks.
• Modified the retrieve_relevant function to call the new subfunctions in the appropriate order.
• Added unit tests for the new subfunctions and the refactored retrieve_relevant function.

Please review and merge this PR. Thank you!

Fixes #1.

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Sandbox Executions

• [X] Check tests/server/chunks/test_chunk_routes.py ✗

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poetry install 2/2 ❌ (`1`)

The currently activated Python version 3.10.12 is not supported by the project (>=3.11,<3.12).
Trying to find and use a compatible version. 
Poetry was unable to find a compatible version. If you have one, you can explicitly use it via the "env use" command.

• [X] Check tests/server/chunks/test_chunk_routes.py ✗

  Sandbox logs for

pre-commit install 1/2 ✓

pre-commit installed at .git/hooks/pre-commit
pre-commit installed at .git/hooks/pre-push

poetry install 2/2 ❌ (`1`)

The currently activated Python version 3.10.12 is not supported by the project (>=3.11,<3.12).
Trying to find and use a compatible version. 
Poetry was unable to find a compatible version. If you have one, you can explicitly use it via the "env use" command.

[sweep-nightly[bot]]

Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.