community[minor]: add oracle autonomous database doc loader integration (#19536)

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- [ ] **PR message**: ***Delete this entire checklist*** and replace
with
- **Description:** Adding oracle autonomous database document loader
integration. This will allow users to connect to oracle autonomous
database through connection string or TNS configuration.
    https://www.oracle.com/autonomous-database/
    - **Issue:** None
    - **Dependencies:** oracledb python package 
    https://pypi.org/project/oracledb/
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`docs/docs/integrations` directory.
  Unit test and doc are added.


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---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/docs/integrations/document_loaders/oracleadb_loader.ipynb

@@ -0,0 +1,154 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "source": [
+    "# Oracle Autonomous Database\n",
+    "\n",
+    "This notebook covers how to load documents from oracle autonomous database, the loader supports connection with connection string or tns config.\n",
+    "\n",
+    "## Prerequisites\n",
+    "1. Database runs in a 'Thin' mode.\n",
+    "   https://python-oracledb.readthedocs.io/en/latest/user_guide/appendix_b.html\n",
+    "2. `pip install oracledb`\n",
+    "   https://python-oracledb.readthedocs.io/en/latest/user_guide/installation.html"
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "outputs": [],
+   "source": [
+    "pip install oracledb"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "is_executing": true
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "outputs": [],
+   "source": [
+    "from langchain_community.document_loaders import OracleAutonomousDatabaseLoader\n",
+    "from settings import s"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "is_executing": true
+    }
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "With mutual TLS authentication (mTLS), wallet_location and wallet_password are required to create the connection, user can create connection by providing either connection string or tns config details."
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "outputs": [],
+   "source": [
+    "SQL_QUERY = \"select prod_id, time_id from sh.costs fetch first 5 rows only\"\n",
+    "\n",
+    "doc_loader_1 = OracleAutonomousDatabaseLoader(\n",
+    "    user=s.USERNAME,\n",
+    "    password=s.PASSWORD,\n",
+    "    schema=s.SCHEMA,\n",
+    "    config_dir=s.CONFIG_DIR,\n",
+    "    wallet_location=s.WALLET_LOCATION,\n",
+    "    wallet_password=s.PASSWORD,\n",
+    "    tns_name=s.TNS_NAME,\n",
+    "    query=SQL_QUERY,\n",
+    ")\n",
+    "doc_1 = doc_loader_1.load()\n",
+    "\n",
+    "doc_loader_2 = OracleAutonomousDatabaseLoader(\n",
+    "    user=s.USERNAME,\n",
+    "    password=s.PASSWORD,\n",
+    "    schema=s.SCHEMA,\n",
+    "    connection_string=s.CONNECTION_STRING,\n",
+    "    wallet_location=s.WALLET_LOCATION,\n",
+    "    wallet_password=s.PASSWORD,\n",
+    "    query=SQL_QUERY,\n",
+    ")\n",
+    "doc_2 = doc_loader_2.load()"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "is_executing": true
+    }
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "With TLS authentication, wallet_location and wallet_password are not required."
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "outputs": [],
+   "source": [
+    "doc_loader_3 = OracleAutonomousDatabaseLoader(\n",
+    "    user=s.USERNAME,\n",
+    "    password=s.PASSWORD,\n",
+    "    schema=s.SCHEMA,\n",
+    "    config_dir=s.CONFIG_DIR,\n",
+    "    tns_name=s.TNS_NAME,\n",
+    "    query=SQL_QUERY,\n",
+    ")\n",
+    "doc_3 = doc_loader_3.load()\n",
+    "\n",
+    "doc_loader_4 = OracleAutonomousDatabaseLoader(\n",
+    "    user=s.USERNAME,\n",
+    "    password=s.PASSWORD,\n",
+    "    schema=s.SCHEMA,\n",
+    "    connection_string=s.CONNECTION_STRING,\n",
+    "    query=SQL_QUERY,\n",
+    ")\n",
+    "doc_4 = doc_loader_4.load()"
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}