Merge branch 'feature/add-event-support' into 'develop'

lib/pleroma/web/activity_pub/transmogrifier.ex

lib/pleroma/web/activity_pub/utils.ex

lib/pleroma/web/mastodon_api/views/status_view.ex

lib/pleroma/web/twitter_api/controllers/util_controller.ex

test/fixtures/tesla_mock/mobilizon.org-event.json

test/fixtures/tesla_mock/mobilizon.org-user.json

test/object/fetcher_test.exs

test/support/http_request_mock.ex

test/web/mastodon_api/views/status_view_test.exs