Added output parsing to reAct agent

[Tsomoriri]

🤔 Reasoning

Trying out structured output parsing in reAct agent

🚧 Changes

• Added ReActOutput class which specifies the agent generate() output format
• Changed test_react to accommodate new style of output

✅ PR Checklist

• Using this PR template?
• Linked issue?
• Added feature?
  • Added/updated docs?
  • Added/updated tests?

[alckasoc]

LGTM, double check linting + quick question:

how sensitive are the output descriptions within ReactOutput? Have you tested this and verified the formatting is correct? How's the output format affected by the output descriptions?

[Tsomoriri]

the linting is failing at the zeroshotreact agent which is an import from langchain. I can try to debug it if its important

Tested the output formatting w.r.t the unit test framework. The formatting is exact match as the input formatting was before.
The descriptions in real world testing is pending due to an issue with my openapi key. But,I doubt that it would raise an issue as I have worked with different agents which do use structured outputs and they work perfectly.