Add `excludedPackages` config

[Breefield]

What

Add a configuration excludeProperties which is a set of strings. If any of these string are found in the moduleVersion of a dependency it will be ignored (case insensitive).

Why

I have a number of internal dependencies which come from an Artifactory that doesn't publish metadata & required authorized connections only (so I get 403's). I am happy to ignore all these dependencies as they're internal.

TODO:

• [x] Add tests
• [ ] Update README.md before merge if this implementation is acceptable