feat: ✨ Make the terminal command aware of its OS, platform and shell

[chezsmithy]

Description

• Made the terminal tool aware of its OS, Platform Arch and default Shell.

Defaults and Observations from testing:

• Windows - cmd.exe but it also appears to be aware it can use powershell. (we could default to powershell if desired).
• Linux - bash
• MacOS - zsh

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. Screen recordings are particularly helpful, and appreciated! ]

Tests

Peformed manual testing on Windows 11, Linux in WSL and MacOS.
The shell is correctly reported and scripts that are created are optimized for the platform and shell.
It's assumed that the extension is installed on the extension host for the platform. For example on Windows 11, I tested using the extension installed in WSL as a remote extension with VSCode running on windows and the shell is reported as bash, running on Linux.

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Summary by cubic

The terminal command tool now detects the current OS, platform architecture, and default shell to optimize commands and scripts. This helps ensure commands run correctly across different environments.

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