feat(nodestore): add Postgres for the doc and index store (#1706)

* Adding Postgres for the doc and index store

* Adding documentation.  Rename postgres database local->simple.  Postgres storage dependencies

* Update documentation for postgres storage

* Renaming feature to nodestore

* update docstore -> nodestore in doc

* missed some docstore changes in doc

* Updated poetry.lock

* Formatting updates to pass ruff/black checks

* Correction to unreachable code!

* Format adjustment to pass black test

* Adjust extra inclusion name for vector pg

* extra dep change for pg vector

* storage-postgres -> storage-nodestore-postgres

* Hash change on poetry lock

settings.yaml

@@ -62,6 +62,9 @@ huggingface:
 vectorstore:
   database: qdrant
 
+nodestore:
+  database: simple
+
 qdrant:
   path: local_data/private_gpt/qdrant
 
@@ -75,6 +78,14 @@ pgvector:
   schema_name: private_gpt
   table_name: embeddings
 
+postgres:
+  host: localhost
+  port: 5432
+  database: postgres
+  user: postgres
+  password: postgres
+  schema_name: private_gpt
+
 sagemaker:
   llm_endpoint_name: huggingface-pytorch-tgi-inference-2023-09-25-19-53-32-140
   embedding_endpoint_name: huggingface-pytorch-inference-2023-11-03-07-41-36-479