feat: add `blas/base/ssbmv`

[aman-095]

Description

What is the purpose of this pull request?

This RFC proposes to add a routine to perform one of the matrix-vector operations y = alpha*A*x + beta*y where alpha and beta are scalars, x and y are n element vectors and A is an n by n symmetric matrix, with k super-diagonals as defined in BLAS Level 2 routines. Specifically adding @stdlib/blas/base/ssbmv is proposed.

Related Issues

Does this pull request have any related issues?

None.

Questions

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No.

Other

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No.

Checklist

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

• [x] Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[kgryte]

@aman-095 I believe that this PR stills needs to be updated based on current conventions, especially wrt the ndarray method.

[aman-095]

Yes, @kgryte, this needs refactoring. I'll complete it soon. 

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/ssbmv	$\color{green}470/470$ $\color{green}+100.00\%$	$\color{green}85/85$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}470/470$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.