Add Streaming Capabiity Tutorial

[igordayen]

Summary

Integration tests for Embabel Agent streaming with OpenAI and Anthropic, covering structured
object streaming, text-instructed thinking, and tool-loop reasoning.

OpenAI (StreamingWithThinkingIntegrationTest)

• whenStreaming_thenReceivesParkingRecommendation — basic structured streaming, single object received via reactive pipeline
• whenStreamingWithInstructedThinking_thenReceivesReasoningBlocks — text-instructed thinking via <think> format; reasoning events emitted per line, tags present or stripped depending on chunking
• whenStreamingMultipleScenarios_thenReceivesRecommendationPerScenario — collection streaming, one object per
  scenario streamed incrementally

Anthropic (StreamingWithThinkingAndToolingIntegrationTest)

• whenStreamingWithThinking_thenReceivesReasoningAndRecommendation — thinking with token budget (< max_tokens=8192), no tools; multiple reasoning events emitted one per output line
• whenStreamingWithThinkingAndTooling_thenReceivesRecommendationAndReasoning — tool-loop streaming with three parking tools; reasoning surfaced only from the final LLM iteration after all tool calls complete

Notes

• Anthropic budget_tokens must be strictly less than max_tokens (8192 for claude-sonnet-4-5)
• Intermediate reasoning between tool calls is not surfaced to the subscriber as per Spring AI Streaming infra
• PR is work-in-progress; need to move common data structures to common module
• switched to 1.0.0 (stable release)