Daemon for automatically handling configuration updates + template rendering from SSM

Overview:

• Runs as a background (daemon) process, which can be executed within a docker container or standalone on EC2 Instance, etc.
• Parses config.json file and attempt to grab parameter store values based off of "keys": []
• Renders "rendered_file" based on "template" value (e.g., nginx template is rendered into an nginx.conf file)
• Reloads process based on "reload_cmd" (e.g., nginx -s reload)
• Templates will be re-rendered and reload_cmd executed

Automatic re-rendering:

• Acts as consumer for AWS Kinesis, which is receiving all parameter store events from event stream
• Any parameter store entries (keys) found within Kinesis that are defined in local config.json will trigger a re-render of templates

TODO:

• Have configuration flag to designate a list of keys as 'render once' vs 'render upon every parameter store key modification'
• Make AWS Kinesis data stream name configurable and provide terraform/etc. for AWS Kinesis data stream creation
• Improve error handling (result types, etc.)