On macOS Add initial PATH to .zshrc rather than .bashrc

[proxyblue]

Apologies for not adding this feature myself, I had issues navigating where this feature is originally within the source code.

macOS Catalina (and future) have moved to zshrc has the default shell - so it would be nice to have as a feature during first run of msfconsole when prompted with:

Would you like to add msfconsole and other programs to your default PATH?

It will install to the appropriate location (bashrc for bash, zshrc for Zshell)

[github-actions]

Hi!

This issue has been left open with no activity for a while now.

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