Summary of the new feature / enhancement

As a user I would like to be able to have AI Shell open up by default when I install the tool. During installation we should prompt the user asking if they would like to have the AI Shell sidecar open (Invoke-AIShell) to open up by default and choose a default agent to use on start up.

Proposed technical implementation details (optional)

Requirements:

• Prompt the user to get consent for
• Get the current agents and let the user choose the default agent to use on start up
• With this information add to the $PROFILE of the user to open whenever PowerShell 7 is ran within Windows terminal
• When the user uninstalls we remove the section of code we added to the user profile so include a uniquely identifiable area in the $PROFILE without deleting any of the other code in the $PROFILE file.