fix(analytical): Fix ret type of `getIntData` and `getDoubleData` for arrow fragment java wrapper

[zhanglei1949]

As titled.

see https://github.com/v6d-io/v6d/blob/ff2aa8f60caec1f20a73b33fd31656f43b9e712f/modules/graph/fragment/arrow_fragment.vineyard-mod#L290

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 46.21%. Comparing base (aa60805) to head (fa476f3). Report is 25 commits behind head on main.

Additional details and impacted files

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