Golang rewrite

[JohnMurray]

This is a long-lived PR as the tooling is re-written to GoLang. Opening a PR for visibility.

Further work on this branch will happen in other branches with PRs into the golang-rewrite branch.

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@569b972). Click here to learn what that means. The diff coverage is 52.5%.

@@           Coverage Diff            @@
##             master     #83   +/-   ##
========================================
  Coverage          ?   52.5%           
========================================
  Files             ?       1           
  Lines             ?     200           
  Branches          ?       0           
========================================
  Hits              ?     105           
  Misses            ?      90           
  Partials          ?       5

Impacted Files	Coverage Δ
lib/chain/chain.go	52.5% <52.5%> (ø)

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