fix: document file copy when metafile is modified

[scolladon]

What does this pull request contains

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• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

Explain your changes

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Make sure document file (even with special extension like .png for example) is copied alongside its meta file when its meta file is modified

Does this close any currently open issues?

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closes #272

• Jest test to check the fix is applied are added.

[codeclimate]

Code Climate has analyzed commit 729f46b and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #276 (729f46b) into main (12ddfc6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #276   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines          607       613    +6     
=========================================
+ Hits           607       613    +6     

Impacted Files	Coverage Δ
src/service/inFileHandler.js	100.00% <ø> (ø)
src/service/inFolderHandler.js	100.00% <100.00%> (ø)
src/service/standardHandler.js	100.00% <100.00%> (ø)
src/service/subCustomObjectHandler.js	100.00% <100.00%> (ø)

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