Implement Aggregation Modes

[kdunee]

Why:

• Currently, IntentGuard uses a simple majority voting system to determine assertion results. This can lead to inconsistent results, especially when dealing with complex or ambiguous assertions.
• Different aggregation modes will provide more flexibility and control over the assertion process, allowing developers to fine-tune the balance between strictness and leniency.

What:

• Introduce three aggregation modes:
  • Strict: Requires unanimous agreement among all LLM evaluations for an assertion to pass.
  • Balanced: Uses the current majority voting system (default).
  • Relaxed: Requires only one LLM evaluation to agree for an assertion to pass.
• Add a new parameter to the IntentGuardOptions class to allow users to specify the desired aggregationmode.
• Update the assertion evaluation logic to incorporate the selected aggregationmode.
• Update documentation and examples to reflect the new aggregation modes functionality.

Acceptance Criteria:

• Strict mode: Assertions only pass if all LLM evaluations agree (e.g., if num_evaluations is 5, all 5 evaluations must agree).
• Balanced mode: Assertions pass if the majority of LLM evaluations agree (e.g., if num_evaluations is 5, at least 3 evaluations must agree).
• Relaxed mode: Assertions pass if at least one LLM evaluation agrees, regardless of the num_evaluations.
• Users can select the aggregation mode through the IntentGuardOptions class using a dedicated parameter (e.g., aggregation_mode).
• Documentation is updated to include details about the new aggregation modes and their usage.
• Example code snippets are provided demonstrating how to use each aggregation mode.