Add support for WorkspaceCreationProperties

[ablackrw]

Implements a fix for #12737, but acceptance tests fail due to aws/aws-sdk-go#3439 . Otherwise ready for review.

• aws/resource_aws_workspaces_directory.go (resourceAwsWorkspacesDirectory()): Add optional creation_properties structure to definition.
  (resourceAwsWorkspacesDirectoryCreate(*schema.ResourceData, interface{})): Set WorkspaceCreationProperties during object creation.
  (resourceAwsWorkspacesDirectoryRead(*schema.ResourceData, interface{})): Process WorkspaceCreationProperties and add to object.
  (resourceAwsWorkspacesDirectoryUpdate(*schema.ResourceData, interface{})): Update WorkspaceCreationProperties if a delta exists.
  (expandCreationProperties([]interface{})): Add helper function for packing the creation_properties struct.
  (flattenCreationProperties(*workspaces.DefaultWorkspaceCreationProperties)): Add helper function for unpacking the DefaultWorkspaceCreationProperties structure
• resource_aws_workspaces_directory_test.go (TestAccAwsWorkspacesDirectory_basic(*testing.T)): Add additional attribute checks.
  (TestExpandCreationProperties(*testing.T)): Add unit test for expandCreationProperties().
  (TestFlattenCreationProperties(*testing.T)): Add unit test for flattenCreationProperties().
  (testAccWorkspacesDirectoryConfigB(string)): Add additional resource (aws_security_group.outbound) and use in aws_workspaces_directory.main definition.
  (testAccWorkspacesDirectoryConfigC(string)): Add additional properties to aws_workspaces_directory.main.
• workspaces_directory.html.markdown: Add documentation on new creation_properties structure.

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Closes #12737

Release note for CHANGELOG:

resource/aws_workspaces_directory: Add `creation_properties` attribute [GH-12737]

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[Tensho]

Duplicates #14577.

[ghost]

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