provider/aws: Add support for CloudSearch

[radeksimko]

This will likely include more than 1 resource.

http://docs.aws.amazon.com/cli/latest/reference/cloudsearch/index.html
http://docs.aws.amazon.com/cli/latest/reference/cloudsearchdomain/index.html

[phinze]

Hey there - we're consolidating Requests for AWS API Coverage over in the spreadsheet linked at #28 - head over there to record your username on what you'd like us to prioritize next!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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