Replace fully qualified Comparator reference with simple class name in AdaptHiveParquetUtil

[j1wonpark]

Why are the changes needed?

Replace fully qualified java.util.Comparator references with simple class name for better readability and consistency with other imports in the file.

Brief change log

• Added import java.util.Comparator to AdaptHiveParquetUtil.java
• Replaced inline java.util.Comparator<Object> with Comparator<Object>

How was this patch tested?

• Run test locally before making a pull request

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.65%. Comparing base (fe98a6c) to head (20c15c0).
⚠️ Report is 15 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (fe98a6c) and HEAD (20c15c0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (fe98a6c)	HEAD (20c15c0)
core	1	0

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4170      +/-   ##
============================================
- Coverage     29.93%   22.65%   -7.28%     
+ Complexity     4229     2612    -1617     
============================================
  Files           675      461     -214     
  Lines         53990    42520   -11470     
  Branches       6838     5994     -844     
============================================
- Hits          16161     9634    -6527     
+ Misses        36636    32049    -4587     
+ Partials       1193      837     -356     

Flag	Coverage Δ
core	?
trino	22.65% <100.00%> (?)

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