Add support for accessibilityPosInSet [Windows Only]

[YajurG]

Add support for the accessibilityPosInSet prop.

Documentation

accessibilitPosInSet Documentation

Behavior

The accessibilityPosInSet prop indicates what position an element is within a set of elements. This prop should take a numeric value.

The value for this prop should be used to set the value of the UIA PositionInSet attached property (See here for documentation on this property).

Implementation Plan

We should:

1. Take the value of the accessibilityPosInSet prop and set the UIA PositionInSet property for that component to be submitted value.

To Be Clarified

Note this prop should be specified in tandem with the accessibilitySetSize prop. We should consider filing a Yellow or Red Box error if the source only specifies accessibilityPosInSet.

[danielayala94]

@Yajur-Grover do we still need this issue open? I see a bunch of filed issues to implement accessibilityPosInSet for each of the core components. Example: #13078