Add functionality to access index value while iterating over primitive array

[jdattatr-tibco]

Add functionality to access index value while iterating over primitive array using $loop[index[ What kind of change does this PR introduce? (check one with "x")

[] Bugfix
[X] Feature
[] Code style update (formatting, local variables)
[] Refactoring (no functional changes, no api changes)
[] Other... Please describe:

Fixes: #

What is the current behavior? Cannot access index for a primitive array

What is the new behavior? Add functionality to access index value while iterating over primitive array