Support parquet load for AWS Neptune Analytics

[adityaramesh12]

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Graph Notebook Version (and Graph Database and Version used if applicable)

Graph Notebook: >=5.0.0
Database: Amazon Neptune

Is your feature request related to a problem? Please describe.
This is a feature supported in Neptune Analytics. We want to expose the parquet bulk load format for Neptune Analytics on graph-notebooks.

Describe the solution you'd like
In the drop down form field in %load magic, we want to add a type for parquet as well.