Add support for parameter manager regional parameters datasource `goo…

…gle_parameter_manager_regional_parameters` (#12651) (#20958)

[upstream:eae83792920ab7e4acc6f5e65c06413c8ecbd7d9]

Signed-off-by: Modular Magician <magic-modules@google.com>

.changelog/12651.txt

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+```release-note:new-datasource
+`google_parameter_manager_regional_parameters`
+```

google/services/parametermanagerregional/data_source_parameter_manager_regional_parameters.go

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+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+package parametermanagerregional

google/services/parametermanagerregional/data_source_parameter_manager_regional_parameters_test.go

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+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+package parametermanagerregional_test

website/docs/d/parameter_manager_regional_parameters.html.markdown

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+---
+subcategory: "Parameter Manager"
+description: |-
+  List the Parameter Manager Regional Parameters.
+---
+
+# google_parameter_manager_regional_parameters
+
+Use this data source to list the Parameter Manager Regional Parameters
+
+~> **Warning:** This datasource is in beta, and should be used with the terraform-provider-google-beta provider.
+See [Provider Versions](https://terraform.io/docs/providers/google/guides/provider_versions.html) for more details on beta datasources.
+
+## Example Usage
+
+```hcl
+data "google_parameter_manager_regional_parameters" "regional-parameters" {
+  location = "us-central1"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+- `project` - (optional) The ID of the project.
+
+- `filter` - (optional) Filter string, adhering to the rules in List-operation filtering. List only parameters matching the filter. If filter is empty, all regional parameters are listed.
+
+- `location` - (Required) The location of regional parameter.
+
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following computed attributes are
+exported:
+
+- `parameters` - A list of regional parameters matching the filter. Structure is [defined below](#nested_parameters).
+
+<a name="nested_parameters"></a>The `parameters` block supports:
+
+- `format` - The format type of the regional parameter.
+
+- `labels` - The labels assigned to the regional parameter.
+
+- `create_time` - The time at which the regional parameter was created.
+
+- `update_time` - The time at which the regional parameter was updated.
+
+- `project` - The ID of the project in which the resource belongs.
+
+- `parameter_id` - The unique name of the resource.
+
+- `name` - The resource name of the regional parameter. Format: `projects/{{project}}/locations/{{location}}/parameters/{{parameter_id}}`
+
+- `policy_member` - An object containing a unique resource identity tied to the regional parameter. Structure is [documented below](#nested_policy_member).
+
+<a name="nested_policy_member"></a>The `policy_member` block contains:
+
+* `iam_policy_uid_principal` - IAM policy binding member referring to a Google Cloud resource by system-assigned unique identifier.
+If a resource is deleted and recreated with the same name, the binding will not be applicable to the
+new resource. Format:
+`principal://parametermanager.googleapis.com/projects/{{project}}/uid/locations/{{location}}/parameters/{{uid}}`
+
+* `iam_policy_name_principal` - AM policy binding member referring to a Google Cloud resource by user-assigned name. If a resource is deleted and recreated with the same name, the binding will be applicable to the
+new resource. Format:
+`principal://parametermanager.googleapis.com/projects/{{project}}/name/locations/{{location}}/parameters/{{parameter_id}}`