Add Percent Deadband filter support for monitored data items

Implements OPC UA Percent Deadband filtering per the Data Access Profile specification for AnalogItemType variables.

- Add percent deadband evaluation logic in DataChangeMonitoringFilter to calculate threshold based on EURange and filter value changes accordingly
- Extend MonitoredDataItem to support percent deadband filtering for scalar values, primitive arrays, and Matrix values
- Update SubscriptionManager to use DataTypeTree for type hierarchy checks when determining AnalogItemType eligibility
- Handle value type transitions (e.g., StatusCode changes, type changes) to trigger notifications even when within deadband threshold
- Add comprehensive test coverage including scalar, array, and Matrix value scenarios with various EURange configurations
- Fix NaN comparison handling in deadband calculations

Author: johannwesely