Python: Update notebooks and add samples for streaming and multiple responses

[awharrison-28]

Motivation and Context

The python notebooks are pinned to 0.2.7.dev0 while the latest pip package for python is 0.3.1.dev0. This PR updates the notebooks to pull the 0.3.1.dev0 and adds 2 new notebooks demonstrating new features added to SK between these versions.

Description

• All notebooks depend on semantic-kernel==0.3.1.dev0
• Added a notebook demonstrating streaming completion responses
• Added a notebook demonstrating multiple responses per prompt (including streaming them)

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows SK Contribution Guidelines (https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
• The code follows the .NET coding conventions (https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions) verified with dotnet format
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[alexchaomander]

LGTM!