Restructure AWS Provider

[YakDriver]

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Relates #12840

This proposal is easier to view as a tree: https://github.com/hashicorp/terraform-provider-aws/tree/td-repackage

.
+-- service
|   +-- apigateway
|       +-- account.go
|       +-- account_test.go
|       +-- authorizer.go
|       +-- authorizer_test.go
|       +-- find.go
|       +-- status.go
|       +-- wait.go
|   +-- appmesh
|   +-- cloudfront
|   +-- ec2
...

[YakDriver]

Go provides an abundance of ways of calling acceptance tests in subdirectories:

What	How To
All tests in current directory and all of its subdirectories	$ go test ./...
Tests for given specific directories	$ go test ./tests/... ./unit-tests/... ./my-packages/...
Tests with import path prefixed with foo/	$ go test foo/...
Tests import path prefixed with foo	$ go test foo...
All tests in $GOPATH	$ go test ...

See: https://stackoverflow.com/questions/16353016/how-to-go-test-all-tests-in-my-project

[github-actions]

This functionality has been released in v3.64.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.