SDSTOR-19372: Add option of chunk size for index vdev.

[sanebay]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.39%. Comparing base (1a0cef8) to head (8713e80).
⚠️ Report is 262 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #800      +/-   ##
==========================================
- Coverage   56.51%   55.39%   -1.13%     
==========================================
  Files         108      110       +2     
  Lines       10300    13246    +2946     
  Branches     1402     1930     +528     
==========================================
+ Hits         5821     7337    +1516     
- Misses       3894     5064    +1170     
- Partials      585      845     +260     

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