[PR] change method name style [paimon]

[via GitHub]

kaixuanzhang123 opened a new pull request, #5539:
URL: https://github.com/apache/paimon/pull/5539

   ### Purpose
   style: change dataFiles method to dataFileMetas 。
   
   DataFiles makes it easy for us to confuse data files with metadata 
files。method and field DataFiles not a good name
   
   ### Tests


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