feat: allow scheduled function to specify timezone

[macdonst]

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This PR adds support for the timezone property. Instead of using AWS::Events::Rule it updates scheduled functions to use AWS::Scheduler::Schedule which supports setting a timezone.

All existing tests pass and added new test coverage.

Did manual testing by deploying a scheduled function with the following arc:

@scheduled
log-sweep
  cron 30 16 ? * * *
  src log-sweep
  timezone America/New_York

and was able to verify in CloudWatch logs that it did run at 4:30pm in the Eastern timezone.

[macdonst]

Oh, I forgot to mention that the tests will fail until the changes to inventory get published.

Resolved