Add support to execute ObjectApi ingestion entirely using TaskGraphs (#257)

This allows the cloud execution of the ingestion driver in a separate TaskGraph enabling:
- Triggering jobs without having access permissions on the client (setting `access_credential_name`)
- Triggering jobs without having all the required Python dependencies for readers and embedding functions.

Tested in Cloud
- [Driver TaskGraph](https://cloud.tiledb.com/compute/logs/taskgraphs/TileDB-Inc/a3f03968-d0fe-491b-afff-80dcb336a769)
- [Embedding generation TaskGraph](https://cloud.tiledb.com/compute/logs/taskgraphs/TileDB-Inc/6ae250e9-0353-442a-9ec2-b93278cb160e)

Author: NikolaosPapailiou

apis/python/examples/object_api/image_search_from_directory.ipynb

@@ -96,7 +96,8 @@
     "    files_per_partition=800,\n",
     "    max_tasks_per_stage=5,\n",
     "    workers=5,\n",
-    ")"
+    ")\n",
+    "index = object_index.ObjectIndex(uri=index_uri)"
    ]
   },
   {

apis/python/examples/object_api/image_search_from_tiledb.ipynb

@@ -144,7 +144,8 @@
     "index.update_index(\n",
     "    max_tasks_per_stage=5,\n",
     "    workers=5,\n",
-    ")"
+    ")\n",
+    "index = object_index.ObjectIndex(uri=index_uri)"
    ]
   },
   {

apis/python/examples/object_api/soma_cell_similarity_search.ipynb

@@ -64,7 +64,8 @@
     "index.update_index(\n",
     "    max_tasks_per_stage=5,\n",
     "    workers=5,\n",
-    ")"
+    ")\n",
+    "index = object_index.ObjectIndex(uri=index_uri)"
    ]
   },
   {

apis/python/examples/object_api/text_search_documents.ipynb

@@ -97,7 +97,8 @@
     "index.update_index(\n",
     "    files_per_partition=100,\n",
     "    config=config,\n",
-    ")"
+    ")\n",
+    "index = object_index.ObjectIndex(uri=index_uri)"
    ]
   },
   {

apis/python/examples/object_api/text_search_wikipedia.ipynb

@@ -114,7 +114,8 @@
     "    workers=2,\n",
     "    max_tasks_per_stage=2,\n",
     "    partition_tile_size=5000,\n",
-    ")"
+    ")\n",
+    "index = object_index.ObjectIndex(uri=index_uri)"
    ]
   },
   {

apis/python/src/tiledb/vector_search/object_api/__init__.py

@@ -1,7 +1,4 @@
+from .embeddings_ingestion import ingest_embeddings_with_driver
 from .object_index import ObjectIndex
-from .embeddings_ingestion import ingest_embeddings
 
-__all__ = [
-    "ObjectIndex",
-    "ingest_embeddings",
-]
+__all__ = ["ObjectIndex", "ingest_embeddings_with_driver"]