[RFC]: add `assign` and `strided` methods to `math/base/special/csignumf`

[anandkaranubc]

Description

This RFC proposes adding an implementation for csignumf.assign( re, im, out, strideOut, offsetOut ) and csignumf.strided( z, sz, oz, out, so, oo ) in math/base/special/csignumf

For csignumf.assign( re, im, out, strideOut, offsetOut ), the function supports the following parameters:

re: real component of the complex number.
im: imaginary component of the complex number.
out: output array.
strideOut: stride length for out.
offsetOut: starting index for out.

For csignumf.strided( z, sz, oz, out, so, oo ), the function supports the following parameters:

z: complex number strided array view.
sz: stride length for z.
oz: starting index for z.
out: output array.
so: stride length for out.
oo: starting index for out.

Related Issues

Reference implementation

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Checklist

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

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[Deepak91168]

PR #7331