Some packages are poorly defined and would benefit from a reorganization. This issue tracks those sub-tasks.

Part of #3898

Remaining tasks

Probably for PMD 7

• [core] Consolidate n.s.pmd.reporting package #3903
• [core] Consolidate n.s.pmd.lang.rule package #3917

Postponed

• [core] Utility classes in pmd 7 #2873