feat: add `blas/base/dtpmv`

[aman-095]

Progresses: #2039.

Description

What is the purpose of this pull request?

This RFC proposes to add a routine to perform one of the matrix-vector operations x = A*x, or x = A**T*x, where x is an N element vector, and A is an N by N unit, or non-unit, upper or lower triangular matrix, supplied in packed form as defined in BLAS Level 2 routines. Specifically adding @stdlib/blas/base/dtpmv is proposed.

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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