feat(server,web): hide faces (#3262)

* feat: hide faces

* fix: types

* pr feedback

* fix: svelte checks

* feat: new server endpoint

* refactor: rename person count dto

* fix(server): linter

* fix: remove duplicate button

* docs: add comments

* pr feedback

* fix: get unhidden faces

* fix: do not use PersonCountResponseDto

* fix: transition

* pr feedback

* pr feedback

* fix: remove unused check

* add server tests

* rename persons to people

* feat: add exit button

* pr feedback

* add server tests

* pr feedback

* pr feedback

* fix: show & hide faces

* simplify

* fix: close button

* pr feeback

* pr feeback

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/test/person_update_dto_test.dart

@@ -28,6 +28,12 @@ void main() {
       // TODO
     });
 
+    // Person visibility
+    // bool isHidden
+    test('to test the property `isHidden`', () async {
+      // TODO
+    });
+
 
   });