Add option to wait for a specific epoch length to bench-tps (#10083)

sdk/src/epoch_info.rs

@@ -0,0 +1,17 @@
+use crate::clock::{Epoch, Slot};
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct EpochInfo {
+    /// The current epoch
+    pub epoch: Epoch,
+
+    /// The current slot, relative to the start of the current epoch
+    pub slot_index: u64,
+
+    /// The number of slots in this epoch
+    pub slots_in_epoch: u64,
+
+    /// The absolute current slot
+    pub absolute_slot: Slot,
+}