Working through serialization and blobs for DFG 0.20

[GearsAD]

Closes

• Serialization and Marshaling (again) #590
• BlobStoreEntry needs both id, and blobId #954
• Just one BlobEntry definition #955
• deprecate Unmarshal.jl and use transcodeType instead? #938
• Consolidate the packing functions between Serialization.jl and CGDFG #525
• Serialize smalldata to a blob-less entry in CGDFG #509

Note we should remove JSON, JSON2, and Unmarshal.

[codecov]

Codecov Report

Merging #962 (6e6f87f) into master (b0399e3) will increase coverage by 72.70%.
The diff coverage is 70.49%.

@@             Coverage Diff             @@
##           master     #962       +/-   ##
===========================================
+ Coverage    0.14%   72.84%   +72.70%     
===========================================
  Files          25       25               
  Lines        2119     1937      -182     
===========================================
+ Hits            3     1411     +1408     
+ Misses       2116      526     -1590     

Impacted Files	Coverage Δ
src/Deprecated.jl	100.00% <ø> (+100.00%)	⬆️
src/DistributedFactorGraphs.jl	100.00% <ø> (+83.33%)	⬆️
src/entities/AbstractDFG.jl	100.00% <ø> (ø)
src/services/AbstractDFG.jl	83.33% <ø> (+83.33%)	⬆️
src/DataBlobs/services/BlobEntry.jl	48.78% <39.28%> (ø)
src/entities/DFGFactor.jl	78.78% <50.00%> (+78.78%)	⬆️
src/entities/DFGVariable.jl	78.04% <57.14%> (+78.04%)	⬆️
src/DataBlobs/services/AbstractBlobEntries.jl	58.33% <62.50%> (ø)
src/DataBlobs/services/BlobStores.jl	78.89% <82.97%> (+78.89%)	⬆️
src/DataBlobs/entities/AbstractBlobEntries.jl	85.71% <85.71%> (ø)
... and 26 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more