Take superseding schema into account during validation

[spenes]

We introduced a new schema metadata field: 'supersededBy'. As the name implies, this field will be used to specify whether schema is superseded by another schema. If it is superseded, superseding schema will be used during validation. Necessary changes are made for this feature on the Iglu Scala Client. On Enrich, we need to bump Iglu Scala Client version. Also, we need to update the part where validation performed in the Enrich. check function will return superseding schema version and Enrich should replace superseded schema version in the event with superseding schema version. Also, it will add additional metadata to the event as context to specify the schema version that is replaced.