Rewrite cloudwatch-metrics.sh script in another language

[Lsquared13]

Problem

While a shell script for emitting cloudwatch metrics was reasonable when it was limited to polling a single RPC call, it's quickly becoming messy and difficult to develop as I add more metrics and more complex logic

Solution

Write a metrics agent in another language (probably Python, maybe Go) that simply uses a geth client and a cloudwatch client to do the same thing.