Check system for existing packages related to setup commands

[pgibler]

Add functionality to check the system for existing packages that are related to the setup commands. There are two ways that this could be done:

1. Before the setup commands are requested, add a step that does the following

• Returns all the packages required to run the desired command.
• Then, run the which command to detect installed packages
• Then, in the system prompt, tell the LLM to exclude all setup commands related to existing packages

2. Include in the full prompt output the required packages alongside the setup commands

• then, run the which command on the system for each existing package
• regex the setup commands and remove the ones that match