redo HomotopyDensityDFG, creep change serialization approach

[dehann]

Alternative redo of -- creep change implementation of serialization:

• Engineering ghost PR, 26Q2/refac/amp15 -- see 1231 instead #1230

At the time of writing, 1230 is good enough for AMP v0.15.0-alpha tests to pass. This redo is easiest path to make sure DFG serialization also works for new HomotopyDensityDFG (replaces StoredHomotopyBelief). Some detail on abstracts in new HomotopyRepr

[codecov]

Codecov Report

❌ Patch coverage is 67.16418% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.28%. Comparing base (9cb713e) to head (07e8cc3).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Deprecated.jl	45.45%	18 Missing ⚠️
src/services/compare.jl	50.00%	3 Missing ⚠️
src/entities/HomotopyDensity.jl	96.15%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1231      +/-   ##
===========================================
- Coverage    80.85%   80.28%   -0.58%     
===========================================
  Files           49       50       +1     
  Lines         2648     2693      +45     
===========================================
+ Hits          2141     2162      +21     
- Misses         507      531      +24     

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[dehann]

Hi @Affie , i was having some trouble with json ignore -- i'll try a bit more and will post here if i learn anything more in the next 30 mins or so. Think this is at good enough a point for you to take over on this PR please

[dehann]

shoot, i messed up -- still a few clean ups that i missed (i blame lack of sleep)