Company-specific link/unlink events

Adds event hooks that a company can extend when a link is created
or unlinked.

We are using this with our custom Kusto/Azure Data Explorer
integration where we are more actively ingesting changes to
link data.

interfaces/companySpecific/events/index.ts

@@ -0,0 +1,12 @@
+//
+// Copyright (c) Microsoft.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+import type { ICompanySpecificEventsLinking } from './linking';
+
+export * from './linking';
+
+export interface ICompanySpecificEvents {
+  linking?: ICompanySpecificEventsLinking;
+}

interfaces/companySpecific/events/linking.ts

@@ -0,0 +1,11 @@
+//
+// Copyright (c) Microsoft.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+import type { ICorporateLink, IProviders } from '../..';
+
+export interface ICompanySpecificEventsLinking {
+  onLink?: (providers: IProviders, link: ICorporateLink) => Promise<void>;
+  onUnlink?: (providers: IProviders, corporateId: string) => Promise<void>;
+}