Add serialization of FinGenAbGroupHom

[HereAround]

cc @antonydellavecchia: Splitting-off changes in #5064 as discussed.

[lgoettgens]

this should also get some pure FinGenAbGroupHom serialization tests (so without any toric stuff in the test). IMO it would even make sense for the PR to be split up into two parts: 1. just adding serialization of FinGenAbGroupHom, 2. using the first PR in a toric setting
That way we could have better release notes for the first part

[HereAround]

this should also get some pure FinGenAbGroupHom serialization tests (so without any toric stuff in the test). IMO it would even make sense for the PR to be split up into two parts: 1. just adding serialization of FinGenAbGroupHom, 2. using the first PR in a toric setting That way we could have better release notes for the first part

Hopefully closer to your desire now, or so I hope. Please take another look.

[lgoettgens]

yeah, I should have given you some more than 3 minutes after opening a PR to bring it in good shape :)

[HereAround]

Failures in this PR likely due to #5201.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.84%. Comparing base (304c6be) to head (3e40fef).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5196   +/-   ##
=======================================
  Coverage   84.83%   84.84%           
=======================================
  Files         710      710           
  Lines       95508    95514    +6     
=======================================
+ Hits        81025    81038   +13     
+ Misses      14483    14476    -7     

Files with missing lines	Coverage Δ
src/Serialization/Groups.jl	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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