[core] Implementation plan for property framework changes

[oowekyala]

This issue serves as easy reference for PRs, and as a discussion for the changes described on the wiki. Replaces #1415

Implementation plan

Due on 6.10.0 ✔️ done

• ([core] First row of deprecations for the properties framework #1420) Deprecate all classes and methods to be removed
• ([core] Implement PropertyFactory #1470) Introduce a PropertyFactory, a PropertyConstraint, etc to get a property creation API
  that is as capable as the current framework, and source compatible with the 7.0.0 API.
  • This doesn't need to implement anything about PropertyXmlSyntax, and doesn't entail changes to the PropertyDescriptor interface. It could be integrated to the current property framework seamlessly
• Deprecate all concrete property types, migrate internal usages to use PropertyFactory
  (should allow us to spot some bugs, enrich API, etc):
  • [core] First row of deprecations for the properties framework #1420
    • MethodMultiProperty
    • MethodProperty
    • TypeMultiProperty
    • TypeProperty
    • FileProperty
  • [core] Deprecate IntegerProperty #1485 IntegerProperty
  • [core] Deprecate some more property types #1486
    • DoubleProperty
    • DoubleMultiProperty
    • FloatMultiProperty
    • FloatProperty
    • IntegerMultiProperty
  • [core] Deprecate regex property #1487 RegexProperty
  • [core] Deprecate string property and string multi property #1501
    • StringMultiProperty
    • StringProperty
  • [core] Deprecate boolean properties #1502
    • BooleanMultiProperty
    • BooleanProperty
  • [core] Deprecate enumerated properties #1505
    • EnumeratedMultiProperty
    • EnumeratedProperty
  • [core] Deprecate char and long properties #1506
    • CharacterMultiProperty
    • CharacterProperty
    • LongMultiProperty
    • LongProperty

Due on 7.0.0

• Removing StatisticalRule is a prerequisite, because its properties can not be converted to the framework
  • [apex] Remove apex statistical rules #1750
  • [java] Remove java statistical rules #1772
  • [core] Remove statistical rule (final step) #2005
• [core] Update remaining properties to use PropertyFactory #2450

Remaining tasks

Probably for PMD 7

• [core] Remove deprecated property concrete classes #4301
• [doc] Document new property framework #4303
• [core] Migrate Property Framework API to Java 8 #4302

Postponed

• [core] Implement blank properties #4304
• [core] New property syntax in XML #4305
• [core] Add additional property value validations #4306
• [core] Turn PropertySource into PropertyBundle #3869
• [core] Allow numeric properties in XML to be within an unbounded range #1204

[adangel]

Closing this tracking issue as done. The remaining tasks are either tracked by #3898 or are postponed.