Implement Begin Measure on iOS Relationship and Index Controls

Added the ability to allow users to manually input Begin Measure value for line feature classes in the iOS application if the line is set as Prompt for Measure = TRUE in CartoPac Studio. When a user attempts to add a linear feature configured to prompt for measure, the user will be asked input a measure value using the same interface used when adding from the Add New Record dialog.

Ensuring users can add linear measure begin values from relationship and index controls enforced data integrity and completeness regarding M-enabled workflows.

This change only applies to the iOS application, specifically on Prompt for Measure enabled feature classes added via relationship and index controls.