[RFC]: add `@stdlib/array/empty`

[kgryte]

Description

This RFC proposes adding a package to return an array having uninitialized memory.

The API should be similar to @stdlib/array/ones.

For non-generic dtypes, we can use @stdlib/buffer/alloc-unsafe and the reinterpret the underlying ArrayBuffer. If Buffer is not a Uint8Array (i.e., Node.js <3.0.0), we should use @stdlib/array/zeros. The Uint8Array check can be part of a polyfill.

In browser environments, memory should be zero-filled, as returning uninitialized memory is not possible.

For generic dtype, we should return a zero-filled array.

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