Add agentic workflow quickstart

[yaron2]

This PR adds an example of creating an agentic durable workflow with human in the loop. The quickstart has 3 variants - Anthropic, OpenAI and Google Gemini. This quickstart shows how Dapr Workflows alone could be used with existing, well known SDKs to create stateful long running LLM workflows.

[bibryam]

This is great demonstration of Dapr APIs combined.
That said, it is more than quickstart that are focused around a single API. This has WF and Conversation API, plus requires token to 3rd party services. IMO this is a great sample, that should be linked from the conversation API docs and quickstarts

[alicejgibbons]

Thanks @bibryam agree, @yaron2 happy to help you with writing docs here but due to the multi-api nature, we need to place this elsewhere. What about https://github.com/dapr/samples/tree/master or a new ai-samples repo?

[yaron2]

This is great demonstration of Dapr APIs combined. That said, it is more than quickstart that are focused around a single API. This has WF and Conversation API, plus requires token to 3rd party services. IMO this is a great sample, that should be linked from the conversation API docs and quickstarts

This is a single API, Workflows in combination with different LLM providers

[yaron2]

Directory structure changed

[alicejgibbons]

Directory structure looks good and going forward we can add new AI-focused samples for each Dapr Building block API as follows:

• AI/workflows/...
• AI/pubsub/...
• AI/jobs/...

I am leaning towards instead of the "human_in_the_loop" name to use something like "external_system_interaction" (as per tutorials to keep the naming convention consistent?

[yaron2]

Directory structure looks good and going forward we can add new AI-focused samples for each Dapr Building block API as follows:

• AI/workflows/...
• AI/pubsub/...
• AI/jobs/...

I am leaning towards instead of the "human_in_the_loop" name to use something like "external_system_interaction" (as per tutorials to keep the naming convention consistent?

Changed

[bibryam]

Looks great, a few minor points

[alicejgibbons]

lgtm!