test(kernel range reader): Adding integration tests for verifying reads and writes size

[abhishek10004]

Description

Adding integration tests for verifying reads and writes size

Link to the issue in case of a bug fix.

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - NA

Any backward incompatible change? If so, please explain.

[gemini-code-assist]

Code Review

This pull request introduces new integration tests to verify large file read and write operations under specific FUSE max request size configurations. It also refactors the MiB constant into a shared utility package. The review feedback identified a potential flakiness issue in the write test due to memory alignment requirements when using syscall.O_DIRECT and suggested replacing magic numbers with constants to improve maintainability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v3.11.1_release@11820d3). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                 @@
##             v3.11.1_release    #4894   +/-   ##
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  Coverage                   ?   83.83%           
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  Files                      ?      173           
  Lines                      ?    21046           
  Branches                   ?        0           
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  Hits                       ?    17643           
  Misses                     ?     2747           
  Partials                   ?      656           

Flag	Coverage Δ
unittests	83.83% <100.00%> (?)

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