This is a follow-up to #8091 which:
- Makes `vc project` the default command, with `vc projects` aliased to `vc project` (previously it was not clear in the code which one was the "real" command)
- Makes some helper names for `ls` more specific
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Since the `vc project` command is about to be expanded with 2 new subcommands, I think it makes sense to do a little bit of refactoring. The current `vc project` command is all in one file, with the logic for subcommands nested within if statements. I think the structure of `vc project` should look more like `vc env`, which is consistent with how commands with subcommands look throughout the rest of the codebase.
This PR moves the logic for the `project` subcommands into their own files.
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