RFC: add BLAS Level 1 srotg routine

[kgryte]

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Description

Description of the feature request.

This RFC proposes to add a routine to construct a Givens plane rotation as defined in BLAS Level 1 routines. Specifically adding @stdlib/blas/base/srotg is proposed.

Related Issues

Does this feature request have any related issues?

No.

Questions

Any questions for reviewers?

No.

Other

Any other information relevant to this feature request? This may include screenshots, references, sample output, and/or implementation notes.

No.