move core::pdu and core::state_res into core::matrix::

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/mod.rs

@@ -8,8 +8,6 @@ pub mod server;
 extern crate conduwuit_core as conduwuit;
 extern crate conduwuit_service as service;
 
-pub(crate) use conduwuit::{Error, Result, debug_info, pdu::PduEvent, utils};
-
 pub(crate) use self::router::{Ruma, RumaResponse, State};
 
 conduwuit::mod_ctor! {}