ses_identity_notification_topic: add support for include_original_headers

[oleg-codaio]

Fixes #4376

Changes proposed in this pull request:

• Support setting whether SES includes original email headers in SNS notifications of the specified type (reference)

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAwsSESIdentityNotificationTopic'

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAwsSESIdentityNotificationTopic -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAwsSESIdentityNotificationTopic_basic
=== PAUSE TestAccAwsSESIdentityNotificationTopic_basic
=== CONT  TestAccAwsSESIdentityNotificationTopic_basic
--- PASS: TestAccAwsSESIdentityNotificationTopic_basic (25.00s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       25.046s

[neilbartley]

@vaskevich would you have the time to update this? If not please yell and I'll get my merge boots on :)

[oleg-codaio]

Sure, updated.

[neilbartley]

Thanks @vaskevich.

Hopefully, this will get merged soon and cut out the only manual step in my proccess ⛏

[mtmn]

Any updates on this?

[oleg-codaio]

It's ready to go on my end. Just need a maintainer to review and merge.

[bflad]

Hi @vaskevich 👋 Sorry for the delay in getting this reviewed. This looks good to me! 🚀

Output from acceptance testing:

--- PASS: TestAccAwsSESIdentityNotificationTopic_basic (17.70s)

[ghost]

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If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!