Move orbax-export to optional deps

[samanklesaria]

Fixes #5352 by moving the orbax-export line of pyproject.toml to the docs section.

[gemini-code-assist]

Summary of Changes

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This pull request refines the project's dependency management by reclassifying orbax-export as an optional dependency, specifically for documentation builds. This adjustment ensures that the core project only includes essential dependencies, thereby streamlining the installation process for users who do not require documentation-specific tools.

Highlights

• Dependency Management: The orbax-export package has been moved from the core dependencies list to the docs optional dependency group in pyproject.toml.
• Issue Resolution: This change addresses and fixes issue Make orbax-export an optional dependency? #5352, likely related to unnecessary core dependencies.

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[gemini-code-assist]

Code Review

This pull request moves the orbax-export dependency from the core dependencies list to the optional docs list in pyproject.toml. This is a logical change that reduces the dependency footprint for users not building the documentation. The change is implemented correctly by removing the dependency from one list and adding it to the other.