Support for `--uri-resolver`

[willfarrell]

New option that allow the use of fast-uri. https://ajv.js.org/options.html#uriresolver

ajv compile ... --uri-resolver=fast-uri -s schema.json -o schema.js

[epoberezkin]

I assume it won't be in dependencies - it would be just a name of JS file to be passed to require that returns the required interface - is that right?

[willfarrell]

That's what I was imagining. I've updated above with what I imagine it could look like.