feat: add math/base/special/roundnf

[Amansingh0807]

Resolves None

Description

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This pull request:

• This PR adds math/base/special/roundnf.

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• Resolves None

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[Amansingh0807]

Hi @kgryte !!
I noticed packages like roundn and others include Python, Julia, and R benchmarks for cross-language performance comparison. Should I add these benchmarks for completeness, or are the current JS/Native benchmarks sufficient for this PR?