feat: add imgproxy

[casualmatt]

WIP.

To start somewhere, I just imported my custom provider for imgproxy.

I used hash.js but that could probably be switch for ohash.

And I'm open to suggestions on how to secure the imgProxySalt and imgProxyKey.

--> Add support provider "imgproxy"

[danielroe]

as you've suggested, let's switch to ohash 🙏

[casualmatt]

I'm not so experienced in hash or ohash, but I think that ohash misses the hmac function to generate the signature.

  const hmac = hash.hmac(hash.sha256, hexDecode(secret));

More in general, I'm open to suggestions on this topic.

[everyx]

@casualmatt I have a implement at #963, using uncrypto, but need async getImage support

[casualmatt]

Ty for the hint, I will work on it tomorrow or later today👍🏻

[casualmatt]

@everyx
I see, .. so to properly support imgproxy, and to do it safely or imgproxy will allow us to optimize any URL provided; we are waiting for:
#276 --> To securely sign the URLs with uncrypto.
#963 --> To support getImage and not just the NuxtImg component.
I hope to get it right,

For now, as an alternative, @danielroe, we could remove the signing of the URL and add big, pretty big, I would say, disclaimer to use the EnvVar IMGPROXY_ALLOWED_SOURCES to secure the install of imgproxy.

[everyx]

Some related resource about "secure the imgProxySalt and imgProxyKey"

#276
#963