Add hfid support for cardinality many relationships

[wvandeun]

• get and set the hfid for related nodes of cardinality many relationships
• add hfid support to RelationshipManager's add/extend/remove methods

[cloudflare-workers-and-pages]

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[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
infrahub_sdk/node.py	14.28%	10 Missing and 2 partials ⚠️

@@            Coverage Diff             @@
##           stable     #370      +/-   ##
==========================================
- Coverage   73.91%   73.80%   -0.11%     
==========================================
  Files          92       92              
  Lines        8536     8548      +12     
  Branches     1676     1680       +4     
==========================================
  Hits         6309     6309              
- Misses       1781     1793      +12     
  Partials      446      446              

Flag	Coverage Δ
integration-tests	25.39% <0.00%> (-0.04%)	⬇️
python-3.10	47.29% <14.28%> (-0.05%)	⬇️
python-3.11	47.29% <14.28%> (-0.07%)	⬇️
python-3.12	47.27% <14.28%> (-0.09%)	⬇️
python-3.13	47.29% <14.28%> (-0.07%)	⬇️
python-3.9	45.68% <14.28%> (-0.09%)	⬇️
python-filler-3.12	24.22% <0.00%> (-0.04%)	⬇️

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Files with missing lines	Coverage Δ
infrahub_sdk/node.py	77.57% <14.28%> (-0.86%)	⬇️

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