Add support for parameter manager parameters datasource google_parameter_manager_parameters (#12652) (#21043)

[upstream:ae6e020d0aa15e1525ae84c5bdf9657b13a5965b]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/12652.txt

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

google/services/parametermanager/data_source_parameter_manager_parameters.go

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

google/services/parametermanager/data_source_parameter_manager_parameters_test.go

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

website/docs/d/parameter_manager_parameters.html.markdown

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+---
+subcategory: "Parameter Manager"
+description: |-
+  List the Parameter Manager Parameters.
+---
+
+# google_parameter_manager_parameters
+
+Use this data source to list the Parameter Manager 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_parameters" "parameters" {
+}
+```
+
+## 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 parameters are listed.
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following computed attributes are
+exported:
+
+* `parameters` - A list of 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 parameter.
+
+* `labels` - The labels assigned to the parameter.
+
+* `create_time` - The time at which the parameter was created.
+
+* `update_time` - The time at which the 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 parameter. Format: `projects/{{project}}/locations/global/parameters/{{parameter_id}}`
+
+* `policy_member` - An object containing a unique resource identity tied to the 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/global/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/global/parameters/{{parameter_id}}`