[App Deployment] create chat with PDF app

[deven298]

Description

This PR adds an example to create a Chat with PDF app using Streamlit and OpenAI.

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 not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d2389d) 58.31% compared to head (801e9ec) 58.31%.
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main    #1049   +/-   ##
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  Coverage   58.31%   58.31%           
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  Files         128      128           
  Lines        4988     4988           
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  Hits         2909     2909           
  Misses       2079     2079           

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