[Feature Request] Build `SingleStepEnv` with `GAIA`

[Wendong-Fan]

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Motivation

Build SingleStepEnv with GAIA

Solution

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Alternatives

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Additional context

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[GitHoobar]

can you elaborate on this @Wendong-Fan ? is it like: Modify the environment to handle GAIA-specific interactions, extending reward structure and verifier format?

[Gupta-02]

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