[enhancement] devShell support for nix-darwin

[unrooted]

Problem

currently, the devShell is working only for x86_64 Linux, and not for nix-darwin

Solution

there are two possible solutions:

1. pretty messy - just make new packages.nix, but only for nix-darwin
2. this might be fixed via using filter and meta.platform goodies from the Nix part, however, requires playing around with it, so that if it goes through the list of packages and it's not found for nix-darwin, it just omits it, without showing an error

Additional context

No response