Error reporting improvements

[RickMoynihan]

• Fixes Some non validation errors such as timeouts raise an exception in the reporter #40 where non-validation errors (e.g. timeouts) would error whilst trying to report the error.

• Small improvement to pretty print errors as a table when possible.

e.g.

14 /Users/rick/repos/pmd-rdf-validations/pmd4/src/swirrl/validations/pmd4/SELECT_DatasetExactlyOneGraph.sparql: FAILED

| :count |                                                 :dataset |
|--------+----------------------------------------------------------|
|      9 |                       http://muttnik.gov/data/animals-ds |
|      2 |                       http://muttnik.gov/data/country-ds |
|      2 | http://muttnik.gov/data/two-dims-multigraph/observations |

It would be nice to improve these tables so the column order is the same as in the select query, however that is likely quite involved.