Implement resource CustomVerificationEmailTemplate

[cPu1]

Issue #, if available: aws-controllers-k8s/community#493.

Description of changes:
This is based off the cPu1:resource/receipt-rule branch and must be reviewed after merging #12.

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

[ack-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cPu1
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[ack-prow]

@cPu1: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ses-verify-attribution	97e181d	link	false	/test ses-verify-attribution
ses-kind-e2e	97e181d	link	true	/test ses-kind-e2e

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