Add TypeScript integrations package

ts/core/classes.integrationregistry.ts

@@ -0,0 +1,25 @@
+import type { BaseIntegration } from './classes.baseintegration.js';
+import type { DiscoveryDescriptor } from './classes.discoverydescriptor.js';
+
+export class IntegrationRegistry {
+  private readonly integrations = new Map<string, BaseIntegration>();
+
+  public register(integrationArg: BaseIntegration): void {
+    if (this.integrations.has(integrationArg.domain)) {
+      throw new Error(`Integration already registered: ${integrationArg.domain}`);
+    }
+    this.integrations.set(integrationArg.domain, integrationArg);
+  }
+
+  public get(domainArg: string): BaseIntegration | undefined {
+    return this.integrations.get(domainArg);
+  }
+
+  public list(): BaseIntegration[] {
+    return [...this.integrations.values()];
+  }
+
+  public getDiscoveryDescriptors(): DiscoveryDescriptor[] {
+    return this.list().map((integrationArg) => integrationArg.discoveryDescriptor);
+  }
+}