Integrate GPT4-vision support

[srbalakr]

Purpose

This PR adds multimodal capabilities to the RAG sample by leveraging azure open ai gpt4 -vision.
Please go through docs/gpt4.md to set up and experience the capability.

Does this introduce a breaking change?

[x ] Yes
[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ x] Feature
[ ] Code style update (formatting, local variables)
[x ] Refactoring (no functional changes, no api changes)
[x ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[pamelafox]

To get 3.9 CI happy, change this line in .github/workflows/python-test.yaml

run: python3 -m pytest -s -vv --cov --cov-fail-under=87

to =86

I didn't quite get coverage back up to 87% :(

[pamelafox]

Looks as expected now. I can do another test azd up or you can merge now, depending when you need it live.

[srbalakr]

Looks as expected now. I can do another test azd up or you can merge now, depending when you need it live.

I did a fresh azd up on Aust East and swiss nor. Looking good. Will merge it in sometime.

[pamelafox]

Sigh am not sure why GitHub decided not to run the checks on the last commit, I had that problem earlier today with another repo. Tests now pass locally.