[2023-03-21][V1] Deprecate listing reward collection endpoint

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DEPRECATION NOTICE

The endpoint to get top 5 listing reward collections has been deprecated, as LooksRare listing rewards have been discontinued since March 15th, 2023. Read more at https://docs.looksrare.org/blog/towards-better-looksrare-rewards

The endpoint is still available, but returns empty data like below:

{
  "success": false,
  "message": "Listing rewards have been discontinued. Read more at https://docs.looksrare.org/blog/towards-better-looksrare-rewards",
  "data": null
}