feat: display kernel-pull-progress using tqdm

changes/181.feature

@@ -0,0 +1 @@
+Display kernel-pull-progress from background-task-reporter

src/ai/backend/client/func/session.py

@@ -298,6 +298,27 @@ async def get_or_create(
         rqst.set_json(params)
         async with rqst.fetch() as resp:
             data = await resp.json()
+            with tqdm(total=100, unit='%') as pbar:
+                task_id = data['background_task']
+                bgtask = resp.session.BackgroundTask(task_id)
+                async with bgtask.listen_events() as response:
+                    async for ev in response:
+                        progress = json.loads(ev.data)
+                        if ev.event == 'bgtask_updated':
+                            current = progress['current_progress']
+                            total = progress['total_progress']
+                            if total == 0:
+                                total = 1e-2
+                            pbar.n = round(current / total * 100, 2)
+                            pbar.update(0)
+                            pbar.refresh()
+                        elif ev.event == 'bgtask_done':
+                            pbar.n = 100.0
+                            pbar.update(0)
+                            pbar.refresh()
+                            pbar.clear()
+                            async with rqst.fetch() as resp:
+                                data = await resp.json()
             o = cls(name, owner_access_key)  # type: ignore
             if api_session.get().api_version[0] >= 5:
                 o.id = UUID(data['sessionId'])