Implement Input Validation for Agentic Evaluators

[m7md7sien]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

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[Copilot]

Pull request overview

This PR implements input validation infrastructure for agentic evaluators in the Azure AI Evaluation SDK. The changes introduce a comprehensive validator system to validate inputs before processing in various evaluator classes.

Changes:

• Added new validator infrastructure with abstract interface and concrete implementations
• Integrated validators into 13 evaluator classes to validate inputs before processing
• Created validation constants for message roles and content types

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
_validator_interface.py	Abstract base class defining validation interface
_validation_constants.py	Enums for message roles and content types
conversation_validator.py	Validates conversation-style query/response inputs
_tool_definitions_validator.py	Validates tool definitions alongside conversations
_tool_calls_validator.py	Validates tool calls alongside tool definitions
_task_navigation_efficiency_validator.py	Validates task navigation inputs
__init__.py	Exports validator classes
_tool_selection.py	Integrated ToolCallsValidator
_tool_output_utilization.py	Integrated ToolDefinitionsValidator
_tool_input_accuracy.py	Integrated ToolDefinitionsValidator
_tool_call_success.py	Integrated ToolDefinitionsValidator
_tool_call_accuracy.py	Integrated ToolCallsValidator
_task_navigation_efficiency.py	Integrated TaskNavigationEfficiencyValidator
_task_completion.py	Integrated ToolDefinitionsValidator
_task_adherence.py	Integrated ToolDefinitionsValidator
_intent_resolution.py	Integrated ToolDefinitionsValidator
_groundedness.py	Integrated ConversationValidator with dual validator setup
_fluency.py	Integrated ConversationValidator
_relevance.py	Integrated ConversationValidator
_coherence.py	Integrated ConversationValidator