WIP: Updated indexing_configuration thing_indexing_configuration with filter

[Oltier]

AWS updated the [Create|Get|Update]IndexingConfiguration requests with a new optional parameter: filter
This filter attribute is required, when named_shadow_indexing_mode is set to ON. https://docs.aws.amazon.com/iot/latest/apireference/API_ThingIndexingConfiguration.html

If filter is missing in the described case above, then the following error message is returned when trying to add a similar configuration:

resource "aws_iot_indexing_configuration" "indexing-config" {
  thing_indexing_configuration {
    thing_indexing_mode              = "REGISTRY_AND_SHADOW"
    thing_connectivity_indexing_mode = "STATUS"
    named_shadow_indexing_mode       = "ON"

    custom_field {
      name = "shadow.name.shadowName.desired.someStringValue"
      type = "String"
    }
  }
}

Error: error updating IoT Indexing Configuration: InvalidRequestException: NamedShadowNames Filter must not be empty for enabling NamedShadowIndexingMode

Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[github-actions]

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[github-actions]

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