Add list-deps sub-command

[Sam Dietrich (xmaams)]

Adds a list-deps subcommand for dependency resolution (such as in cmake) without rebuild.
Also add a small test case vs a golden file

[Sam Dietrich (xmaams)]

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[blakepelton (blakepelton)]

LGTM, although I'm not the Haskel expert. Did you write this code yourself? One additional test you could add is as script that compares the --list-deps output against the --file-list output.

[Sam Dietrich (xmaams)]

LGTM, although I'm not the Haskel expert. Did you write this code yourself? One additional test you could add is as script that compares the --list-deps output against the --file-list output.

Added a test to compare vs compile --file-list.
Copilot helped with the Haskell, which is probably for the best... But I did read it closely and it looks fine to me with my limited knowledge. I checked that dependency lists did not change between this build and main.