[AAE-4995] Expand ADF PeopleContentService to create new person (#6931)

* [AAE-4995] Expose create/list content users API in ADF PeopleContentService

* * Updated documentation

* * Removed listPeople api

* * Added unit tests and improved old tests

* * Updated doc with js-api doc link

* *Fixed lint errors

* * Fixed failing unit tests

lib/core/mock/ecm-user.service.mock.ts

@@ -90,3 +90,12 @@ export let fakeEcmEditedUser = {
     enabled: true,
     emailNotificationsEnabled: true
 };
+
+export const createNewPersonMock = {
+    id: 'fake-id',
+    firstName: 'fake-ecm-first-name',
+    lastName: 'fake-ecm-last-name',
+    description: 'i am a fake user for test',
+    password: 'fake-avatar-id',
+    email: 'fakeEcm@ecmUser.com'
+};