feat(wasm-image-processor): allow .webp, .avif input files to loadImage

[igorbrasileiro]

Feature Request

As title says, to allow more file types for loadImage function.

If applicable, also try to get file type from response.headers 'content-type'.

I used bug described here #213, and I faked a .webp file url like the snippet below to loadImage, then applied the resize and it worked.

const image = loadImage('https://myfile.com/file.webp?ext=.jpg')
const resized = image.resize(200, 200, false)

[igorbrasileiro]

I could implement this feature

[pablodiehl]

Hello @igorbrasileiro, thanks for opening the issue.
We'll take a look, however if you feel like contributing to the project, feel free to propose the changes by submitting a PR, we'd be pleased to review it! 😄