RPN+Calculator+Insert+into+Stack

As a user I want to be able to insert a new number after an existing number on the stack so that I can add something in I forgot.

UAT

 * [6, 4, 19, 6, 8] 3 311 -> [6, 4, 311, 19, 6, 8]
 * [41] 1 19 -> [19, 41]
 * [] 4 19 --> []/error

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