Rename `mrb_os_memsize_of_hash_table` to `mrb_hash_memsize`

* The term `hash_table` can be misleading because the return value of this
  function includes memory usage of entire `Hash` object, including not only
  hash table part but also entry list part, etc.
* This function takes a `Hash` object as a receiver and is defined in
  `src/hash.c`, so it is natural to have a `mrb_hash_` prefix.

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