chore: introduce functions samples

[dwsupplee]

Based on https://github.com/googleapis/gapic-generator-php/pull/483 as a way to check out a service involving the upcoming samples.

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 11 region tags.

• Functions/samples/V1/CloudFunctionsServiceClient/call_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_CallFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/create_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_CreateFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/delete_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_DeleteFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/generate_download_url.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GenerateDownloadUrl_sync
• Functions/samples/V1/CloudFunctionsServiceClient/generate_upload_url.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GenerateUploadUrl_sync
• Functions/samples/V1/CloudFunctionsServiceClient/get_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GetFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/get_iam_policy.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GetIamPolicy_sync
• Functions/samples/V1/CloudFunctionsServiceClient/list_functions.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_ListFunctions_sync
• Functions/samples/V1/CloudFunctionsServiceClient/set_iam_policy.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_SetIamPolicy_sync
• Functions/samples/V1/CloudFunctionsServiceClient/test_iam_permissions.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_TestIamPermissions_sync
• Functions/samples/V1/CloudFunctionsServiceClient/update_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_UpdateFunction_sync

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