feat(genai): elevates GenAI feature to its own service library

[mvilanova]

Summary of Code Changes

New Files Added

• exceptions.py:

  • Introduced a new exception class GenAIException that inherits from DispatchException.

• service.py:

  • Added a new service module with functions to generate historical context and analysis summaries for cases related to signals.
  • Implemented generate_case_signal_historical_context to create historical context for a case.
  • Implemented generate_case_signal_summary to generate an analysis summary using an AI plugin.

Modifications in Existing Files

• messages.py:

  • Removed the use of SlackApiError and WebClient from Slack SDK.
  • Integrated the new AI service to generate GenAI signal analysis messages.
  • Simplified the create_genai_signal_analysis_message function by removing direct Slack API calls and using the AI service for generating summaries.

• plugin.py:

  • Added a new method get_conversation_replies to fetch replies from a specific thread in a Slack conversation.
  • Updated the SlackConversationPlugin to use the new AI service for generating GenAI signal analysis messages.

These changes introduce a new exception handling mechanism and enhance the AI-driven analysis capabilities by integrating a new service module. The Slack integration has been refactored to utilize these new services, simplifying the code and improving maintainability.