feat(account): Hide internal attribute fields

These fields are not intended for use by API consumers, so we hide
them from the generated API documentation by marking them as INTERNAL.

internal/proto/controller/api/resources/accounts/v1/account.proto

@@ -7,6 +7,7 @@ option go_package = "github.com/hashicorp/boundary/sdk/pbs/controller/api/resour
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/wrappers.proto";
 import "google/protobuf/struct.proto";
+import "google/api/visibility.proto";
 import "controller/api/resources/scopes/v1/scope.proto";
 import "controller/custom_options/v1/options.proto";
 
@@ -43,8 +44,16 @@ message Account {
 	oneof attrs {
 		// The attributes that are applicable for the specific Account type.
 		google.protobuf.Struct attributes = 100 [(custom_options.v1.generate_sdk_option) = true, (custom_options.v1.subtype) = "default"];
-		PasswordAccountAttributes password_account_attributes = 101 [(custom_options.v1.generate_sdk_option) = true, (custom_options.v1.subtype) = "password"];
-		OidcAccountAttributes oidc_account_attributes = 102 [(custom_options.v1.generate_sdk_option) = true, (custom_options.v1.subtype) = "oidc"];
+		PasswordAccountAttributes password_account_attributes = 101 [
+			(google.api.field_visibility).restriction = "INTERNAL",
+			(custom_options.v1.generate_sdk_option) = true,
+			(custom_options.v1.subtype) = "password"
+		];
+		OidcAccountAttributes oidc_account_attributes = 102 [
+			(google.api.field_visibility).restriction = "INTERNAL",
+			(custom_options.v1.generate_sdk_option) = true,
+			(custom_options.v1.subtype) = "oidc"
+		];
 	}
 
 	// Output only. managed_group_ids indicates IDs of the managed groups that currently contain this account