add start and finish write method calls to base object serialize

.vscode/launch.json

@@ -4,6 +4,7 @@
   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+    
     {
       "name": "Python: Current File",
       "type": "python",
@@ -13,10 +14,13 @@
       "justMyCode": false
     },
     {
-      "name": "Python: Test debug config",
+      "name": "Pytest",
       "type": "python",
-      "request": "test",
+      "request": "launch",
+      "program": "poetry",
+      "args": ["run", "pytest"],
       "console": "integratedTerminal",
+      "justMyCode": true
     }
   ]
 }

specklepy/serialization/base_object_serializer.py

@@ -7,12 +7,10 @@ from warnings import warn
 from typing import Any, Dict, List, Tuple
 from specklepy.objects.base import Base, DataChunk
 from specklepy.logging.exceptions import (
-    SerializationException,
     SpeckleException,
     SpeckleWarning,
 )
 from specklepy.transports.abstract_transport import AbstractTransport
-import specklepy.objects.geometry
 import specklepy.objects.other
 
 PRIMITIVES = (int, float, str, bool)
@@ -72,6 +70,10 @@ class BaseObjectSerializer:
         object_builder.update(speckle_type=base.speckle_type)
         obj, props = base, base.get_serializable_attributes()
 
+        if self.write_transports:
+            for wt in self.write_transports:
+                wt.begin_write()
+
         while props:
             prop = props.pop(0)
             value = getattr(obj, prop, None)
@@ -174,6 +176,11 @@ class BaseObjectSerializer:
 
         del self.lineage[-1]
 
+
+        if self.write_transports:
+            for wt in self.write_transports:
+                wt.end_write()
+
         return hash, object_builder
 
     def traverse_value(self, obj: Any, detach: bool = False) -> Any: