feat: new surface custom LROs

[bshaffer]

See googleapis/gax-php#569 and googleapis/gax-php#570

Adds configuration for Request classes for custom operations, which is required for V2

Also ensures that "DIREGAPIC Enums" are not generated for new surface clients.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroClient/create_foo.php:25, tag customlro_generated_CustomLro_CreateFoo_sync
• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroOperationsClient/cancel.php:25, tag customlro_generated_CustomLroOperations_Cancel_sync
• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroOperationsClient/delete.php:25, tag customlro_generated_CustomLroOperations_Delete_sync
• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroOperationsClient/get.php:25, tag customlro_generated_CustomLroOperations_Get_sync

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