fix: add support for 'any' unit, when parsing <count> <unit> ago.

Similar to Git, any unit is allowed and will default to seconds, like `60 flurps ago`
will mean a minute in the past.

gix-date/src/parse.rs

@@ -156,7 +156,7 @@ mod relative {
             "month" => Span::new().try_months(units),
             "year" => Span::new().try_years(units),
             // Ignore values you don't know, assume seconds then (so does git)
-            _ => return None,
+            _anything => Span::new().try_seconds(units),
         };
         Some(result.map_err(|_| Error::RelativeTimeConversion))
     }

gix-date/tests/time/parse.rs

@@ -184,6 +184,7 @@ mod relative {
         // For comparison, a few are the same as in: https://github.com/git/git/blob/master/t/t0006-date.sh
         let cases = [
             ("5 seconds ago", 5.seconds()),
+            ("12345 florx ago", 12_345.seconds()), // Anything parses as seconds
             ("5 minutes ago", 5.minutes()),
             ("5 hours ago", 5.hours()),
             ("5 days ago", 5.days()),