feat: Add SlidingSyncRoom::avatar

It's been recently added in the specification, 50ae2c8d65...kegan/sync-v3.

crates/ruma-client-api/src/sync/sync_events/v4.rs

@@ -17,7 +17,7 @@ use ruma_common::{
     },
     metadata,
     serde::{duration::opt_ms, Raw},
-    DeviceKeyAlgorithm, OwnedRoomId,
+    DeviceKeyAlgorithm, OwnedMxcUri, OwnedRoomId,
 };
 use serde::{Deserialize, Serialize};
 
@@ -419,6 +419,10 @@ pub struct SlidingSyncRoom {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub name: Option<String>,
 
+    /// The avatar of the room.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub avatar: Option<OwnedMxcUri>,
+
     /// Was this an initial response.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub initial: Option<bool>,

crates/ruma-common/src/identifiers/mxc_uri.rs

@@ -14,7 +14,6 @@ type Result<T, E = MxcUriError> = std::result::Result<T, E>;
 /// A URI that should be a Matrix-spec compliant [MXC URI].
 ///
 /// [MXC URI]: https://spec.matrix.org/latest/client-server-api/#matrix-content-mxc-uris
-
 #[repr(transparent)]
 #[derive(PartialEq, Eq, PartialOrd, Ord, Hash, IdZst)]
 pub struct MxcUri(str);