Miniagents

MiniAgents.on_serialize_message

bigger small hashes for Nodes - same size as git commit hashes are (40 hex digits)

- utils.join_messages() function
- shorter hash keys

Actual (Mini)Agents are finally introduced (miniagent decorator)

- Introduced PromiseContext class with default settings, that also ensures that all tasks are completed before program exits (as long as PromiseContext() is used as a context manager)
- Introduced promise collection event handlers attachable to PromiseContext instance - they are triggered after StreamedPromise().acollect() is done

Possibility to use PromptLayer