Refactor GraphsDFG serialization (loadDFG, saveDFG)

[Affie]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 72.30769% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.01%. Comparing base (9a09a9a) to head (60df8d5).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/services/AbstractDFG.jl	6.25%	15 Missing ⚠️
src/DataBlobs/entities/BlobStores.jl	0.00%	2 Missing ⚠️
src/DataBlobs/services/BlobStores.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1197      +/-   ##
===========================================
+ Coverage    56.54%   58.01%   +1.47%     
===========================================
  Files           37       37              
  Lines         2407     2439      +32     
===========================================
+ Hits          1361     1415      +54     
+ Misses        1046     1024      -22     

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