Adding a simple debug agent to manually test actions

[TLSDC]

Description by Korbit AI

What change is being made?

Add a new debug agent in debug_agent.py for manual testing of actions within the browser gym environment.

Why are these changes being made?

This change introduces a tool to facilitate the manual testing of actions, providing a way to interactively verify and debug the system's behavior using the DebugAgent, which outputs a text representation of the observation and takes input for actions. This supports developers in quickly testing environments without relying solely on automated frameworks.

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