[Command] Add ability for `source-wand init` to point to a target directory (instead of in `.` directory)

When you run `source-wand init`, the output is in the `.` directory you are running the tool. I want to be able to choose where the output of all the files & directories are created.

Start at the implementation of the `source-wand init` command and trace how it chooses the current directory and creates files and directories. Add a way to supply a target directory, then verify that all generated output is created there instead of in `.`.

Written by the indexing model from the issue text.