Run submission in a separate thread, and more explicit state

Also more explicit timeouts and an overall better handling of errors.

benchmark/space/global_state.py

@@ -1,9 +1,18 @@
+import enum
 import threading
 import typing
 
 
 class G:
     """Global state of the Benchmark Client."""
+
+    class State(enum.Enum):
+        welcome = 1
+        running = 2
+        complete = 3
+        submitting = 4
+
+    state = State.welcome
     result_platform = ''
     progress_status = ''
     result_stats = ''
@@ -15,6 +24,7 @@ class G:
     cached_system_info = {}
     cached_compute_devices = []
     results_submitted = False
+    results_url = ''
 
     images = {}
     current_progress = 0.0
@@ -25,6 +35,7 @@ class G:
     @classmethod
     def reset(cls):
         """Reset the global state."""
+        cls.state = G.State.welcome
         cls.result_platform = ''
         cls.progress_status = ''
         cls.result_stats = ''
@@ -32,4 +43,5 @@ class G:
         cls.background_image_path = ""
         cls.scene_status = {}
         cls.results_submitted = False
+        cls.results_url = ''
         cls.submission_exception = None