Feature request: Support `nix flake` subcommands

[x10an14]

Especially nix flake check, out of the box =)

So that nix flake check --log-format internal-json -v |& nom --json can be just nom flake check =)

[x10an14]

ref: https://github.com/maralorn/nix-output-monitor/issues/103#issuecomment-1634128128

[AsbjornOlling]

+1 for this. I'd love to have nom flake check

[maralorn]

It‘s on the road map.