Implement copy-and-delete fallback for atomicMove

[THEAccess]

Fixes #137

This change introduces a fallback mechanism for atomicMove in FileCodec.kt. If atomicMove is unsupported (e.g., on Android 7 and below), it now attempts to copy the temporary file to the destination and then deletes the temporary file. Error handling is included to ensure the temporary file is cleaned up in case of a copy failure.

I don't know if this is the best solution. Comments welcome.

[BenjyTec]

Thanks for the fix - the maintainer needs to approve this merge, correct?

[THEAccess]

Thanks for the fix - the maintainer needs to approve this merge, correct?

Yes, that is correct

[xxfast]

Hi! Thanks for the PR. Is there a way to branch off to the unsupported mode for unit testing purpose?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.68%. Comparing base (f745302) to head (9b17f88).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage   92.24%   92.68%   +0.44%     
==========================================
  Files           8        8              
  Lines         116      123       +7     
  Branches       12       12              
==========================================
+ Hits          107      114       +7     
  Misses          1        1              
  Partials        8        8              

Files with missing lines	Coverage Δ
...n/kotlin/io/github/xxfast/kstore/file/FileCodec.kt	100.00% <100.00%> (ø)

[xxfast]

Thank you for your contributions 🫡 Sorry for the delay