[PR] Fix: Validate dictionary index bit width in Parquet reader [arrow-rs]

[via GitHub]

dhruvxvaishnav opened a new pull request, #10725:
URL: https://github.com/apache/arrow-rs/pull/10725

   # Which issue does this PR close?
   
   - Closes #10722.
   
   # Rationale for this change
   
   When reading dictionary-encoded Parquet data pages with DictIndexDecoder or 
ByteArrayDictionaryReader, the first byte was read via data[0] without checking 
if data is empty, and the index it_width was passed to RleDecoder without 
checking the 


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