[Feature]: Option to remove unhealthy sequences from corpus

[rappie]

Feature Description

⇾ corpus: health: 1%, sequences: 7560 (121 valid, 7361 invalid)

In the case of an unhealthy corpus after a big refactor, it would be nice to keep the valid sequences.

Problem / Use Case

Currently the only way to "clean up" a corpus this unhealthy is to start from scratch