Initializing maelstrom-go-test.toml

If there is no maelstrom-go-test.toml in the workspace root, then maelstrom-go-test will use a default configuration.

When it comes time to build a more complex configuration, you can have maelstrom-go-test write out the default configuration:

maelstrom-to-test --init

This will create a maelstrom-go-test.toml file in the workspace root, unless one already exists, then exit. The resulting maelstrom-go-test.toml will contain the default configuration. It will also include some commented-out examples that may be useful.