topdown: Rename notes package to lineage and add Fail filter

These changes just rename the notes package so that it can be used
more generally. In addition, it adds another filter to show Fail
events and their lineage. The Fail filter will be exposed like the
Notes filter and will hopefully be useful in test scenarios.

This change is backwards incompatible but it's unlikely that anyone
outside of OPA was depending on the notes package. Updating
dependencies to use lineage.Notes instead of notes.Filter should be
easy enough if needed.

Signed-off-by: Torin Sandall <torinsandall@gmail.com>