[RFC]: add `math/base/special/atanf`

[gunjjoshi]

Description

Description

This RFC proposes adding math/base/special/atanf, which would be a single precision implementation for math/base/special/atan.

float stdlib_base_atanf( const float x )

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• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

[gunjjoshi]

I would like to work on this.

[gunjjoshi]

For this, we will need constants/float32/pi. I will be making a separate PR for that.

[gunjjoshi]

#2042 must be merged for this.

[gunjjoshi]

#2046 must also be merged for this.