feat: support context cancellation in file store

[lucasrod16]

Closes #619

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.94%. Comparing base (d9e1d43) to head (66bf5e9).
Report is 1 commits behind head on main.

Files	Patch %	Lines
content/file/file.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #803      +/-   ##
==========================================
+ Coverage   77.88%   77.94%   +0.06%     
==========================================
  Files          63       63              
  Lines        4694     4698       +4     
==========================================
+ Hits         3656     3662       +6     
+ Misses        657      656       -1     
+ Partials      381      380       -1     

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[Wwwsylvia]

@lucasrod16 Thank you for the contribution! Code changes LGTM.
Can we add some unit tests and make sure the diff coverage reaches 80%?

[lucasrod16]

@lucasrod16 Thank you for the contribution! Code changes LGTM. Can we add some unit tests and make sure the diff coverage reaches 80%?

@Wwwsylvia Yes! I added a unit test for tarDirectory. I tried to verify the coverage locally with codecov-cli but ran into errors about requiring a token for uploading the report

[Wwwsylvia]

LGTM

[shizhMSFT]

LGTM