sync: Consider using a table in the output

Similar to https://github.com/exercism/canonical-data-syncer/issues/51.

See https://github.com/exercism/canonical-data-syncer/pull/44, where @ee7 wrote:
> I think 3 verbosity levels is a good number - maybe we don't want to cram e.g. `--verbosity=full` or `--verbosity=debug` into the `--help` message (or try to explain verbosity levels "1" to "4")?
>
> Other things I thought of before are:
>
> 1. Sort the output by category (missing tests/no canonical data/up-to-date) then alphabetically, rather than just alphabetically. Maybe we could even do this only with `--verbosity=detailed`. Or add an option to control the sorting.
> 2. Add colors to help us distinguish between `[warn]` and `[skip]`, or between missing/non-canonical/up-to-date.
> 3. **Use a table for the output.**
>
> I think I'd prefer to try out options 1 and 2 before adding another verbosity level. What do you think?

and @ErikSchierboom wrote:
> My preference would then be to use colors to help distinguish the output. I'm not in favor of adding sorting options and I'm unsure about the categories. **A table could also be nice**.