Restructure Repo w/ Go Modules and Add Darwin arm64 support

[bwagner5]

Issue #, if available:
#1
#9

Description of changes:

• Move go src and repo structure to a more conventional and modern go structure
  • Move any main packages to the top-level cmd dir
  • Upgrade go build version to 1.16
  • Use go modules (using the repo as the module name) and remove all checked-in vendor deps
  • Remove unmaintained uuid lib and replace w/ google/uuid
• Support Darwin arm64 builds and packaging
• Make bash packaging scripts safer by exiting if an error occurs w/ set -euo pipefail
• Add proper github PR template w/ correct license
• Add github actions workflow w/ checkstyle and quick-test targets to check PRs automatically

Testing:

• make checkstyle quick-test PASSED
• make build-darwin-arm64 package-darwin-arm64 PASSED
• Built binary and tested connecting an ec2-instance. PASSED

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[cguertin14]

+5000 files changed, there might be a problem somewhere? just wondering.

[bwagner5]

@cguertin14 Hi! The 5,000 files changed are mainly removing the vendor (dependency source code) checked in to this repo in favor of using Go modules to pull dependencies at compile time.

[phene]

Any chance of this getting updated with resolved conflicts and merged?