feat(nodeinfo): extract and save NodeInfo information from instances to display it on instances list

We also try to detect the application actor if it's not given by NodeInfo metadata (FEP-2677)
(guessing for Mobilizon, PeerTube & Mastodon).

Closes #1392

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

src/types/instance.model.ts

@@ -3,6 +3,10 @@ import { InstanceFollowStatus } from "./enums";
 export interface IInstance {
   domain: string;
   hasRelay: boolean;
+  instanceName: string | null;
+  instanceDescription: string | null;
+  software: string | null;
+  softwareVersion: string | null;
   relayAddress: string | null;
   followerStatus: InstanceFollowStatus;
   followedStatus: InstanceFollowStatus;