Refactor: Extract partition_filters out of ManifestEvaluator

[marvinlanhenke]

Problem:

1. The partition_filter is also required by the ExpressionEvaluator; thus should be moved outside ManifestEvaluator; cached by spec_id in scan.rs and then used by ExpressionEvaluator as well as the ManifestEvaluator
2. Also fn create_manifest_evaluator + ManifestEvaluator::new both do some setup work; here I'd propose to move the setup code completely into fn create_manifest_evaluator and avoid splitting the setup over mutliple places

[marvinlanhenke]

I also like to work on this one; since it kind of blocks #358.