Feature pipeline with Snowflake as a data source (#258)

* Add a snowflake example, with snowflake as a data source to FGs in Hopsworks and fix polars tutorial

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Co-authored-by: Jim Dowling <jim@hopsworks.ai>

Author: jimdowling

integrations/polars/quickstart_polars.ipynb

@@ -1090,7 +1090,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.18"
+   "version": "3.10.0"
   },
   "widgets": {
    "application/vnd.jupyter.widget-state+json": {