Support for API cape service info fetching

[xsyanic]

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request/enhancement.

Description

We should be able to add "api" url in fabric.mod.json and config/cape-provider.json5 like

{
  "id": "test",
  "api": "https://somewhere/api.json"
} 

Which would have the cape service's details that we usually put directly in config such as-
uriTemplate, animated, textureResolverId, changeCapeUrl, homepage, antiFeatures, rateLimitedReqPerSec

so it can be updated easily without touching the config, as if the servers changes by chance, it would not create problems.

Additional information

No response

[haray-67]

This is actually a good idea when used with #141