Fix some legacy package names in Batch JSR 352

Description

For instance the class org.hibernate.search.batch.jsr352.core.massindexing.step.lucene.spi.EntityReader is used by both backends, there is no reason to keep it in a package named lucene.

Environment

None
Fixed

Assignee

Fabio Massimo Ercoli

Reporter

Fabio Massimo Ercoli

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