Request to add double precision suport to fixed_radius_search

[Woodman3]

Checklist

• I have searched for similar issues.
• For Python issues, I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for main branch).

Proposed new feature or change

i found when build torch ops and use cuda module, the fixed_radius_searchfunction don't support double type,and unit test said that the GPU only supports single precision float.can i impl double precision support for this function?

References

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Additional information

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