Figure out initializing Plugs at boot time
Currently both our rate limiter and upload limit Plug are initialized at compile-time, making it impossible to tweak on OTP releases. Initializing them at runtime is an option (see https://github.com/elixir-plug/plug/pull/889 ), but I imagine this can get quite expensive. We should figure out a way to initialize them at boot time
cc @plataformatec