Add a struct for session stats + bump the counters

crates/librqbit/src/session_stats/atomic.rs

@@ -0,0 +1,10 @@
+use std::sync::atomic::AtomicU64;
+
+use crate::torrent_state::live::peers::stats::atomic::AggregatePeerStatsAtomic;
+
+#[derive(Default, Debug)]
+pub struct AtomicSessionStats {
+    pub fetched_bytes: AtomicU64,
+    pub uploaded_bytes: AtomicU64,
+    pub peers: AggregatePeerStatsAtomic,
+}

crates/librqbit/src/session_stats/mod.rs

@@ -0,0 +1 @@
+pub mod atomic;