Optimize the GetSheetDimension implemention, make it read by stream, more fast.

[Neugls]

…so not load the entire sheet into memory

PR Details

make GetSheetDimension read xml tag by stream, using xmlDecoder which used in Rows() method.

Description

Make GetSheetDimension read the xml file in stream, no need to load the entire xml file into memory, so the performance is much better for large Excel files.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (d13cd91) to head (a1aedff).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2188   +/-   ##
=======================================
  Coverage   99.24%   99.24%           
=======================================
  Files          32       32           
  Lines       30495    30520   +25     
=======================================
+ Hits        30264    30289   +25     
  Misses        153      153           
  Partials       78       78           

Flag	Coverage Δ
unittests	99.24% <100.00%> (+<0.01%)	⬆️

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[xuri]

Thanks for your PR. I added unit tests for this changes based on your branch.