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/tools/models/domain/email-forwarder-options.ts

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