provider/aws: Add support for CloudWatch Events

[radeksimko]

This is closing #4827

TODO list:

• Implementation of aws_cloudwatch_event_rule
• Implementation of aws_cloudwatch_event_target
• Documentation for aws_cloudwatch_event_rule
• Documentation for aws_cloudwatch_event_target
• Acceptance tests for aws_cloudwatch_event_rule
• Acceptance tests for aws_cloudwatch_event_target
• Workaround for cases where user deletes target or rule outside of TF
• Example with Kinesis
• Example with SNS
• Example with Lambda - this functionally depends on provider/aws: Add aws_lambda_permission #4826

[radeksimko]

This is now ready for review.

[stack72]

Love this little helper! This will be able to be used elsewhere :)

[stack72]

@radeksimko this looks really good - i've made a few comments on some possible questions but apart from that it LGTM

[radeksimko]

@stack72 I fixed all of the things you reported except one. I hope the reasons make sense.

I reran all related tests after making the changes & Travis also returns green now, so I'm merging this.

[stack72]

Thanks for the fixes @radeksimko :)

[ghost]

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