[RFC]: replace `copyView` in `ndarray/array/lib/copy_view.js` with `ndarray/copy`

**Description**

In `ndarray/array/lib/copy_view.js`, the `copyView` function manually creates an output buffer, constructs a plain ndarray-like
object, and uses `ndarray/base/assign` to copy data.

The function contains the following TODO comment:

```js
function copyView( arr, dtype ) { // TODO: consider replacing with `@stdlib/ndarray[/base]/copy` once created
```

Now that `ndarray/copy` exists, the manual logic can be replaced by importing `ndarray/copy`, removing the following unnecessary imports:

- `@stdlib/ndarray/base/assert/is-equal-data-type`
- `@stdlib/buffer/alloc-unsafe`
- `@stdlib/ndarray/base/buffer-ctors`
- `@stdlib/ndarray/order`
- `@stdlib/ndarray/base/numel`
- `@stdlib/ndarray/base/shape2strides`
- `@stdlib/ndarray/base/assign`
- `@stdlib/array/base/zeros`