[RFC]: mismatch between BLAS band storage and `to-compact` layout

### Description

## Description

While implementing `blas/base/cgbmv`, I noticed that the band matrix storage format expected by BLAS `gbmv` differs from the layout produced by [`@stdlib/array/base/banded/to-compact`](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/banded/to-compact).

`to-compact` produces a **diagonal-centered layout**, whereas BLAS expects a **band storage layout** compatible with the `gbmv` routines (as documented in ([Intel® oneAPI Math Kernel Library](https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-dpcpp/2023-1/matrix-storage.html#GUID-7101306A-AB1A-4A3D-9ED5-21E0B5404202)).

Because of this difference, `to-compact` cannot be directly used for preparing matrices for `gbmv`.

This behaviour is only present in **colexicographic** or column wise packing.

### For example, given:
```js
var A = [
[ 1, 2, 3, 0, 0 ],
[ -2, 4, 5, 6, 0 ],
[ -3, -5, 7, 8, 9 ],
[ 0, -6, -8, 10, 11 ],
[ 0, 0, -9,-11, 12 ]
];
```

### Output from `to-compact`

#### Column wise (colexicographic) packing
```js
AC = toCompact( A, 2, 2, true );
/* e.g., returns =>
[
[ 0, 0, 1, -2, -3 ],
[ 0, 2, 4, -5, -6 ],
[ 3, 5, 7, -8, -9 ],
[ 6, 8, 10, -11, 0 ],
[ 9, 11, 12, 0, 0 ]
]
*/
```

### Expected BLAS band storage (MKL / Netlib)

BLAS gbmv expects band matrices packed differently.
> Band Matrix
A general band matrix A of m rows and n columns with kl sub-diagonals, ku super-diagonals and leading dimension lda is represented as a one dimensional array a of size at least lda * n (respectively, lda * m) if column (respectively, row) major layout is used.
Before entry in any BLAS function using a general band matrix, the leading (kl + ku + 1) by n (respectively, m) part of the array a must contain the matrix A. This matrix must be supplied column-by-column (respectively, row-by-row), with the main diagonal of the matrix in row ku (respectively, column kl) of the array (0-based indexing), the first super-diagonal starting at position 1 (respectively, 0) in row (ku – 1) (respectively, column (kl + 1)), the first sub-diagonal starting at position 0 (respectively, 1) in row (ku + 1) (respectively, column (kl – 1)), and so on. Elements in the array a that do not correspond to elements in the band matrix (such as the top left ku-by-ku triangle) are not referenced.

```js
Acompact = [
[  0,   0,  1,  2, 3 ],
  [  0,  -2,  4,  5, 6 ],
  [ -3,  -5,  7,  8, 9 ],
  [ -6,  -8, 10, 11, 0 ],
  [ -9, -11, 12,  0, 0 ]
]
```

### Related Issues

Related issues # , # , and # .

### Questions

No.

### Demo

_No response_

### Reproduction

```shell
var toCompact = require('@stdlib/array/base/banded/to-compact');

var A = [
[ 1, 2, 3, 0, 0 ],
[ -2, 4, 5, 6, 0 ],
[ -3, -5, 7, 8, 9 ],
[ 0, -6, -8, 10, 11 ],
[ 0, 0, -9,-11, 12 ]
];

var AC = toCompact( A, 2, 2, true );

console.log( AC );
```

### Expected Results

```shell
[
[ 0, 0, 1, 2, 3 ],
[ 0, -2, 4, 5, 6 ],
[ -3, -5, 7, 8, 9 ],
[ -6, -8, 10, 11, 0 ],
[ -9, -11, 12, 0, 0 ]
]
```

### Actual Results

```shell
[
[ 0, 0, 1, -2, -3 ],
[ 0, 2, 4, -5, -6 ],
[ 3, 5, 7, -8, -9 ],
[ 6, 8, 10, -11, 0 ],
[ 9, 11, 12, 0, 0 ]
]
```

### Version

_No response_

### Environments

Node.js

### Browser Version

_No response_

### Node.js / npm Version

20.20.0

### Platform

Linux

### Checklist

- [x] Read and understood the [Code of Conduct](https://github.com/stdlib-js/stdlib/blob/develop/CODE_OF_CONDUCT.md).
- [x] Searched for existing issues and pull requests.

Start with the @stdlib/array/base/banded/to-compact entry point and the blas/base/cgbmv implementation mentioned in the issue. Compare their colexicographic storage conventions with the linked BLAS documentation, then inspect related issues and the package tests. Done means the intended column-wise layout is explicitly decided and the observed output agrees with that decision.

Vom Indexierungsmodell aus dem Issue-Text verfasst.