Create aws_cloudwatch_event_rule and aws_cloudwatch_event_target that runs event:reindex_touched_dois on events container once per day

[codycooperross]

Purpose

This PR adds an aws_cloudwatch_event_rule and an aws_cloudwatch_event_target that runs event:reindex_touched_dois on an events container once per day. Terraform config is borrowed from examples like the following:

https://github.com/search?q=aws_cloudwatch_event_rule+bundle+exec+rake&type=code

Expected result: once per day, according to the cron schedule_expression, an events task is booted up and bundle exec rake event:reindex_touched_dois is run. This queues reindexing for DOIs touched by relevant events in the previous day. The task is retired once the rake task completes.

See these PRs for relevant events work:

• Reindexing queueing for touched DOIs events#82
• Permit SQS messages and correct message body format events#83
• Default event:reindex_touched_dois to run task for events updated yesterday events#84

closes: Add github issue that originated this PR

Approach

Open Questions and Pre-Merge TODOs

Learning

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

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[wendelfabianchinsamy]

This is super clever by the way! I learned something new 😄.