Add error names

[Jake-Shadle]

Similarly to cliippy, add simple and clear names for each lint in cargo-deny, which would mean that check could also support the same command line options

-W --warn OPT       Set lint warnings
-A --allow OPT      Set lint allowed
-D --deny OPT       Set lint denied

To allow the command line to override the severity level of a particular/all lint, eg CI could -D warnings to turn all warnings into errors.