Initial commit for postgresql dataset provider

Core implementation of postgresql dataset for llama stack

Signed-off-by: Josh Salomon <jsalomon@redhat.com>

llama_stack/providers/remote/datasetio/postgresql/config.py

@@ -0,0 +1,40 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+from pydantic import BaseModel, Field
+from typing import Any, Dict
+import os
+
+from llama_stack.providers.utils.kvstore.config import (
+    KVStoreConfig,
+    SqliteKVStoreConfig,
+)
+
+
+class PostgreSQLDatasetIOConfig(BaseModel):
+    kvstore: KVStoreConfig
+
+    pg_host: str = Field(default="localhost")  # os.getenv("POSTGRES_HOST", "127.0.0.1")
+    pg_port: int = Field(default=5432)
+    # TODO - revise secutiry implications of using env vars for user and password
+    pg_user: str = Field(default="postgres")
+    pg_password: str = Field(default="fail")
+    pg_con_pool_size: int = Field(default=3)
+    pg_database: str = Field(default="postgres")
+
+    @classmethod
+    def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> Dict[str, Any]:
+        return {
+            "kvstore": SqliteKVStoreConfig.sample_run_config(
+                __distro_dir__=__distro_dir__,
+                db_name="postgresql_datasetio.db",
+            ),
+            "pg_host": os.getenv("POSTGRES_HOST", "127.0.0.1"),
+            "pg_port": os.getenv("POSTGRES_PORT", 5432),
+            "pg_user": os.getenv("POSTGRES_USER", ""),
+            "pg_password": os.getenv("POSTGRES_PASSWORD", ""),
+            "pg_con_pool_size": os.getenv("POSTGRES_CONN_POOL_SIZE", 3),
+            "pg_database": os.getenv("POSTGRES_DATABASE", "postgres"),
+        }