[feat] Implement Task Agent Interface and Flow

[devzeebo]

Problem

Currently all executions have hooks. We need to pare down the requirements of the execution engine to allow invoking an agent definition without any hooks (known as a Task Agent)

Proposed solution

Split the task invocation into two "types" of tasks:

• Script tasks
• LLM tasks
  • LLM tasks are simply a framework provided script task that calls an engine

Alternatives considered

No response

Area

Orchestrator

Additional context

No response