StepLabelPosition API in JavaScript (ES5) Stepper API control

Defines the label position in the Stepper.

• Bottom - Displays the label on bottom position regardless of the Stepper’s orientation.
• End - Displays the label on right side regardless of the Stepper’s orientation.
• Start - Displays the label on left side regardless of the Stepper’s orientation.
• Top - Displays the label on top position regardless of the Stepper’s orientation.