change Buffer to Uint8Array in fromRgbaPixels

[KhafraDev]

hi

this allows for the following (only needed for typescript):

import { Transformer } from './index.js'

const width = 256
const height = 256
const uint8 = new Uint8Array(width * height * 4)
const transformer = Transformer.fromRgbaPixels(uint8, width, height)

this creates an empty 256x256 image. I use it to overlay multiple images without having to resize/stretch/overlap each other

Buffer is still allowed too, since it's a subclass of Uint8Array

const buffer = Buffer.alloc(width * height * 4) // slower
const transformer = Transformer.fromRgbaPixels(buffer, width, height)

---

it was possible before but I needed to cast Uint8Array to Buffer for typescript to be happy

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