Goal: 

• Add metadata information to sources and pubkeys endpoint response:
  • Limit 
  • Offset 
  • Total count 
  • Links
  • examples: https://github.com/RedHatInsights/sources-api-go/blob/319a22e189750d878d5554e5a746c8ada6b4fe23/util/collection_response.go#L27C14-L27C14
  •  https://github.com/osbuild/image-builder/blob/cbf859e57b97bef8c795d01cf2c7ecb5947ee9d4/internal/v1/handler.go#L453C13-L453C13

Acceptance Criteria:

• When making a request to an endpoint that supports offset and limit parameters, the response includes a meta payload containing the requested information. For instance: 

  "meta": {
      "count": 6,
      "limit": 100,
      "offset": 0
    },
    "links": {
      "first": "/api/sources/v3.1/sources?limit=100&offset=0",
      "last": "/api/sources/v3.1/sources?limit=100&offset=100"
    }