[ENG-708] Thumbnail sharding (#925)

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* first phase, basic sharding

* improved API for sharding using a "thumbnailKey"

* clean up param handling for custom_uri

* added version manager with migrations for the thumbnail directory

* remove redundant hash of a hash, silly

* fix mobile

* fix clippy

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Co-authored-by: Utku Bakir <74243531+utkubakir@users.noreply.github.com>

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