Update inbound-ses-spam-filter to include Lambda ARN

[dballance]

Issue #, if available: N/A

Description of changes: Currently, this filter is pretty useless to deploy as a nested stack. I cannot use the published resource because I cannot tie the Function ARN to my SES ReceiptRuleAction. This change adds an output so that this template is useful for nested deployments.

Description of how you validated changes: No validation

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #1294 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop   #1294   +/-   ##
=======================================
  Coverage     94.5%   94.5%           
=======================================
  Files           72      72           
  Lines         3746    3746           
  Branches       742     742           
=======================================
  Hits          3540    3540           
  Misses         104     104           
  Partials       102     102

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[keetonian]

Thank you for contributing this fix!