Assign ownership to many libs files (#6928)

Assign ownership to many of the remaining libs/common files.

Criteria for ownership:
* Files used by a single team, is now owned by that team.
* Files related to a domain owned by a team is now owned by that team.
* Where ownership is unclear the "lowest level" service takes ownership.

libs/common/src/models/domain/email-forwarder-options.ts

@@ -1,5 +0,0 @@
-export class EmailForwarderOptions {
-  name: string;
-  value: string;
-  validForSelfHosted: boolean;
-}

libs/common/src/models/domain/provider.ts

@@ -1,49 +0,0 @@
-import { ProviderUserStatusType, ProviderUserType } from "../../admin-console/enums";
-import { ProviderData } from "../../admin-console/models/data/provider.data";
-
-export class Provider {
-  id: string;
-  name: string;
-  status: ProviderUserStatusType;
-  type: ProviderUserType;
-  enabled: boolean;
-  userId: string;
-  useEvents: boolean;
-
-  constructor(obj?: ProviderData) {
-    if (obj == null) {
-      return;
-    }
-
-    this.id = obj.id;
-    this.name = obj.name;
-    this.status = obj.status;
-    this.type = obj.type;
-    this.enabled = obj.enabled;
-    this.userId = obj.userId;
-    this.useEvents = obj.useEvents;
-  }
-
-  get canAccess() {
-    if (this.isProviderAdmin) {
-      return true;
-    }
-    return this.enabled && this.status === ProviderUserStatusType.Confirmed;
-  }
-
-  get canCreateOrganizations() {
-    return this.enabled && this.isProviderAdmin;
-  }
-
-  get canManageUsers() {
-    return this.isProviderAdmin;
-  }
-
-  get canAccessEventLogs() {
-    return this.isProviderAdmin;
-  }
-
-  get isProviderAdmin() {
-    return this.type === ProviderUserType.ProviderAdmin;
-  }
-}

libs/common/src/models/domain/tree-node.ts

@@ -1,21 +0,0 @@
-export class TreeNode<T extends ITreeNodeObject> {
-  node: T;
-  parent: TreeNode<T>;
-  children: TreeNode<T>[] = [];
-
-  constructor(node: T, parent: TreeNode<T>, name?: string, id?: string) {
-    this.parent = parent;
-    this.node = node;
-    if (name) {
-      this.node.name = name;
-    }
-    if (id) {
-      this.node.id = id;
-    }
-  }
-}
-
-export interface ITreeNodeObject {
-  id: string;
-  name: string;
-}