Add does-not-match as opposite sense of matches #1513
Description
Is your feature request related to a problem? Please describe.
A customer has a need to drop traces that do not match a certain regular expression. It's not always possible to invert a regular expression, especially in the Go implementation of regexp.
Describe the solution you'd like
Add does-not-match as an inverse to matches.
Describe alternatives you've considered
Inverting drop to keep and having drop be the default -- but that doesn't always work.