support SBML writing

[exaexa]

title says it. Depends on SBML 1.0.1, not yet released. 1.1 (pretty new)

[github-actions]

🟢  Commit babedb4 is formatted properly.

[exaexa]

depends on LCSB-BioCore/SBML.jl#225, which depends on JuliaPackaging/Yggdrasil#5224

[codecov]

Codecov Report

Merging #639 (4356673) into develop (1cbb61a) will increase coverage by 0.40%.
The diff coverage is 77.77%.

@@             Coverage Diff             @@
##           develop     #639      +/-   ##
===========================================
+ Coverage    90.29%   90.69%   +0.40%     
===========================================
  Files           79       79              
  Lines         1926     1935       +9     
===========================================
+ Hits          1739     1755      +16     
+ Misses         187      180       -7     

Impacted Files	Coverage Δ
src/base/utils/gene_associations.jl	94.54% <ø> (+3.63%)	⬆️
src/base/types/SBMLModel.jl	84.90% <62.50%> (+0.59%)	⬆️
src/io/sbml.jl	85.71% <80.00%> (-14.29%)	⬇️
src/base/utils/Reaction.jl	97.43% <100.00%> (ø)
src/io/io.jl	88.88% <100.00%> (+7.63%)	⬆️
src/io/json.jl	100.00% <0.00%> (+71.42%)	⬆️

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