ABI data type support:  String and Address

## Problem

https://github.com/algorandfoundation/ARCs/blob/main/ARCs/arc-0004.md supports `String` and `Address` data types.  To help support ARC-4 application App definition and calls, 1st class support for these data types is needed.

## Solution



## Dependencies

N/A

## Urgency

TBD