Добавление новой страницы EndlessPage

Добавление новой страницы EndlessPage, в которой будет реализован функционал бесконечного холста.

изменил веху на %Этап 1

добавил метку 2d

requested review from @LaVey

By Anton Medvedev on 2023-08-20T11:32:09 (imported from GitLab)

assigned to @LaVey

By Anton Medvedev on 2023-08-20T11:32:09 (imported from GitLab)

approved this merge request

By Anton Medvedev on 2023-08-20T11:32:14 (imported from GitLab)

mentioned in commit ff1327f7

By Anton Medvedev on 2023-08-20T11:32:24 (imported from GitLab)

merged