feat: add `blas/base/cher2`

[ShabiShett07]

Progresses #2039.

Description

What is the purpose of this pull request?

This pull request:

• Adds the package blas/base/cher2

Related Issues

Does this pull request have any related issues?

This pull request:

• progresses #2039

Questions

Any questions for reviewers of this pull request?

No.

Other

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

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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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/cher2	$\color{red}519/523$ $\color{green}+99.24\%$	$\color{red}56/58$ $\color{green}+96.55\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{red}519/523$ $\color{green}+99.24\%$

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