feat(rnd): Implement agent block execution logic for AutoGPT Server

[majdyz]

Background

This PR implements the main logic of the block execution engine for AutoGPT-Server.
An integration test is added to test the behavior.

What you can do now with this PR:
You can manually create a graph, by using the existing blocks as nodes (or write your own). Then execute the graph with an input.

What you can't do yet:
Listen to the graph execution result/update (you can follow the AgentNodeExecution table result, though).

Changes 🏗️

• Split data.py (model file) into three modules:
  • execution: a model for node execution.
  • graph: a model for graph structure.
  • block: a model for agent block/component.
• Implemented executor main logic
• Simplify db structure:
  • Remove AgentBlockInputOutput in favor of inputSchema & outputSchema using serialized json/dict structure.
  • Remove id on AgentBlock in favor of using name (class name of the block) as its identifier.
  • Added constantInput column for AgentNode for hard-coded input/block configuration. Hence, removingexecutionStateData on AgentNodeExecution.
  • Rename AgentNodeLink input/output to source/sink to avoid confusion
• Change multithreading to multiprocessing, to allow the use of multiple prisma asynchronous client.

PR Quality Scorecard ✨

• Have you used the PR description template?   +2 pts
• Is your pull request atomic, focusing on a single change?   +5 pts
• Have you linked the GitHub issue(s) that this PR addresses?   +5 pts
• Have you documented your changes clearly and comprehensively?   +5 pts
• Have you changed or added a feature?   -4 pts
  • Have you added/updated corresponding documentation?   +4 pts
  • Have you added/updated corresponding integration tests?   +5 pts
• Have you changed the behavior of AutoGPT?   -5 pts
  • Have you also run agbenchmark to verify that these changes do not regress performance?   +10 pts

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[kcze]

Structure looks good! My main concern is typing; we could use schema or at least use something better than dict[str, str] for Block inputs/outputs. I understand that we need to store all that inside the database, but I don't think we should ignore type safety.

Change requests have been addressed. Feel-free to add more comment in the PR though if there are more comments, I'll address it in the following PR.