Add OpenSearch SQL JDBC datasource

### Datasource configuration
```
[
  {
    "name": "myspark",
    "connector": "jdbc",
    "properties": {
      "url": "jdbc:hive2://localhost:10000/default",
      "user": "xxx",
      "password": "yyy"
    }
  }
]
```

### API
```
source = myspark.jdbc("query string")
```