Download nltk files in build step

[Fluder-Paradyne]

Description

Download nltk files in build step

Related Issues

Solution and Design

Checked the running image and found that nltk downloads two files 'averaged_perceptron_tagger' and 'punkt'
so we are downloading and keeping these files in the build step itself

Test Plan

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Docs update

Checklist

• My pull request is atomic and focuses on a single change.
• I have read the contributing guide and my code conforms to the guidelines.
• I have documented my changes clearly and comprehensively.
• I have added the required tests.

[CLAassistant]

All committers have signed the CLA.