go through a ton of pedantic clippy lints

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/appservice_server.rs

@@ -30,7 +30,7 @@ where
                 Error::BadServerResponse("Invalid destination")
             })
             .unwrap()
-            .map(|body| body.freeze());
+            .map(bytes::BytesMut::freeze);
 
         let mut parts = http_request.uri().clone().into_parts();
         let old_path_and_query = parts.path_and_query.unwrap().as_str().to_owned();