Major refactor introducing Dependency injection

[rohan-uiuc]

No description provided.

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ AttributeError: 'list' object has no attribute 'metadata' ai_ta_backend.utils.context_parent_doc_padding ... View Issue
• ‼️ AttributeError: 'list' object has no attribute 'metadata' ai_ta_backend.utils.context_parent_doc_padding ... View Issue
• ‼️ AttributeError: 'dict' object has no attribute 'metadata' ai_ta_backend.service.retrieval_service in getT... View Issue
• ‼️ ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response')) getTopContexts View Issue
• ‼️ ReadTimeout: The read operation timed out getAll View Issue

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