This commit supports enabling encryption when creating a room.

Type: add

BUG: https://iron.lily-is.land/T69

Verify unit tests pass.
Open CreateRoomPage.
Click on Public in room type. Verify E2EE check box is unchecked.
Click on Private or Direct in room type. Verify E2EE checkbox is checked.
Check/uncheck E2EE checkbox. Change room type again, and verify that E2EE checkbox does not change.
Verify you can create an encrypted room and an unencrypted room.