Define browser manager API (#1497)

Co-authored-by: Shuchang Zheng <shu@skyvern.com>

skyvern/forge/sdk/schemas/persistent_browser_sessions.py

@@ -0,0 +1,15 @@
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict
+
+
+class PersistentBrowserSession(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    persistent_browser_session_id: str
+    organization_id: str
+    runnable_type: str | None = None
+    runnable_id: str | None = None
+    created_at: datetime
+    modified_at: datetime
+    deleted_at: datetime | None = None