feat: add constants/float32/phi

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• adds constants/float32/phi, which would be the single precision variant of constants/float64/phi.

Related Issues

Does this pull request have any related issues?

None.

Questions

Any questions for reviewers of this pull request?

No.

Other

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Float64 and Float32 values for reference:

In [2]: float64ToFloat32(1.618033988749895)
Out[2]: 1.6180340051651

In [3]: float64ToFloat32( 1.61803398874989484820458683436563811772030917980576286213544862 )
Out[3]: 1.6180340051651

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers
@Planeshifter

[Planeshifter]

LGTM!