feat(swagger): manager, extend restore progress with bandwidth (#4082)

Restore progress now contains download/stream bytes/duration
and host shard count, which allows us to calculate per shard
bandwidth on sctool side.

v3/swagger/scylla-manager.json

@@ -866,6 +866,12 @@
             "$ref": "#/definitions/RestoreKeyspaceProgress"
           }
         },
+        "hosts": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/RestoreHostProgress"
+          }
+        },
         "views": {
           "type": "array",
           "items": {
@@ -1102,6 +1108,34 @@
         }
       }
     },
+    "RestoreHostProgress": {
+      "type": "object",
+      "properties": {
+        "host": {
+          "type": "string"
+        },
+        "shard_cnt": {
+          "description": "Host shard count",
+          "type": "integer"
+        },
+        "downloaded_bytes": {
+          "description": "Total bytes downloaded by host",
+          "type": "integer"
+        },
+        "download_duration": {
+          "description": "Total time spent by host on download in milliseconds",
+          "type": "integer"
+        },
+        "streamed_bytes": {
+          "description": "Total bytes load&streamed by host",
+          "type": "integer"
+        },
+        "stream_duration": {
+          "description": "Total time spent by host on load&stream in milliseconds",
+          "type": "integer"
+        }
+      }
+    },
     "TaskRunValidateBackupProgress": {
       "type": "object",
       "properties": {