Feature/simple rag implementation

[MeshkatShB]

With this feature, you can now upload files only for following extensions to give more information to the models.

.pdf, .txt, .docx, .rtf, .jpg, .jpeg, .png, .xlsx, .xls

Now you can give task, additional info, and file to the model.

[MeshkatShB]

task:

"go to instacart.com and add the grocery list to cart. if added, your work is done. finish."

.txt file content:

grocery list:
apple
banana
peach

Sample GIF 1:

Sample GIF 2:

[CLAassistant]

All committers have signed the CLA.