[WIP] Add Invoke API TypeSpec for Foundry Agents

[Kishore712]

Summary

Adds TypeSpec definitions for the new Invoke API (POST /invoke) endpoint for the Foundry Agents service.

Changes

• invoke/models.tsp — Request/response models: InvokeRequest, InvokeResponse, AgentDef, AgentDefType, InputItem, ResumeRequest, InvokeAnnotation, InvocationStatus, OutputItem,
  UsageInfo
• invoke/routes.tsp — Route definition for POST /invoke with streaming support
• sdk-service-agents-contracts/client.tsp — Access/usage annotations for invoke types
• sdk-service-agents-contracts/main.tsp — Import invoke routes into the agents contracts module

Context

The invoke endpoint is a model-agnostic, agent-centric invocation API for v2 hosted agents (ADC-based). Key features:

• Lightweight agent reference (AgentDef) instead of full agent definition
• Text-based input model (not chat message format)
• Session management with session_id
• Interrupt/resume flow via ResumeRequest with interrupt_id
• Both synchronous and streaming (stream: true) response modes
• Structured annotations and usage metadata in responses

[github-actions]

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   described in Section 4 below), Submit to any Project.
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   defenses of lack of personal jurisdiction and forum non-conveniens.
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    supersedes any and all prior agreements, understandings or communications, written or oral, between
    the parties relating to the subject matter hereof. This Agreement may be assigned by Microsoft.

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
TypeSpec	Azure.AI.Projects
Python	azure-ai-projects
JavaScript	@azure/ai-projects

[splusq]

@RaviPidaparthi for review