Implement "Agent" (models.py and Dashboard)

[abrichr]

Feature request

An OpenAdapt Agent consists of:

• model.py classes:

class Agent:
    name: str

class AgentContext:
    recordings: list[Recordings]
    ...

class Replay:
    agent: Agent
    agent_context: AgentContext
...

• Dashboard mechanism to easily create agents by selecting recordings

Motivation

Giving the user tools to specify desired behavior