Add support for startOffset in list API

[singhravidutt]

No description provided.

[singhravidutt]

/gcbrun

[codecov]

Codecov Report

❌ Patch coverage is 90.35088% with 11 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (branch-3.1.x@ad536df). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...gle/cloud/hadoop/gcsio/GoogleCloudStorageImpl.java	90.38%	1 Missing and 4 partials ⚠️
...doop/gcsio/testing/InMemoryGoogleCloudStorage.java	82.14%	2 Missing and 3 partials ⚠️
...hadoop/gcsio/GoogleCloudStorageFileSystemImpl.java	94.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             branch-3.1.x    #1460   +/-   ##
===============================================
  Coverage                ?   82.82%           
  Complexity              ?     2261           
===============================================
  Files                   ?      119           
  Lines                   ?     9959           
  Branches                ?     1216           
===============================================
  Hits                    ?     8249           
  Misses                  ?     1209           
  Partials                ?      501           

Flag	Coverage Δ
integrationtest	68.06% <80.70%> (?)
unittest	73.14% <55.26%> (?)

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