Introduce evaluators for agentic workflows

[shyamnamboodiripad]

Introduces the following new evaluators as part of the Quality package: ToolCallAccuracyEvaluator, TaskAdherenceEvaluator, IntentResolutionEvalutor. Since the package is already GA, the new evaluators are currently marked [Experimental].

Also includes following changes:

• Fixes a regex bug that was causing reasoning and chain of thought outputs present in the evaluation response to not be parsed correctly into the corresponding metrics.
• Adds support for displaying tool calls and tool results in the conversation displayed in the report. This fixes [AI Evaluation] Tool messages (or anything without 'Text' contents) are not rendered in reports #6370
• Adds support for displaying JSON content both in the conversation as well as in context (along with a new settings toggle for controlling pretty printing for the displayed JSON).
• Adds tests for the new evaluators.

Fixes #6350
Fixes #6370

Microsoft Reviewers: Open in CodeFlow

[peterwald]