List source specs

curl --request GET \
  --url https://api.portable.io/v2/sourcespecs \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "0": {
      "name": "google_calendar",
      "displayName": "Google Calendar",
      "website": "https://calendar.google.com",
      "tagLine": "Calendar App",
      "lifecycle": "STABLE",
      "authenticationStrategy": "AUTH_CODE"
    },
    "1": {
      "name": "freshsales",
      "displayName": "Freshsales",
      "website": "https://www.freshworks.com",
      "tagLine": "Sales CRM",
      "lifecycle": "STABLE",
      "authenticationStrategy": "TOKEN"
    }
  }
}