ViolationType API in React Gantt API component

Defines the types of constraint violations in task scheduling.

• MustStartOn - Task startDate is not equal to the constraintDate.
• MustFinishOn - Task finishDate (startDate + duration - 1) is not equal to the constraintDate.
• StartNoLaterThan - Task startDate is later than the constraintDate.
• FinishNoLaterThan - Task finishDate is later than the constraintDate.
• PredecessorLink - Task startDate violates the predecessor’s endDate and offset.