Import annotations better for SBML

[stelmo]

julia> model = load_model(ObjectModel, "iLC858.xml")
COBREXA.Types.ObjectModel(#= 1187 reactions, 1096 metabolites =#)

julia> reaction_annotations(model, "R_rxn12637_c")
Dict{String, Vector{String}} with 7 entries:
  "bigg.reaction"     => ["AMPEP13", "MEAMP1(gly-asp)"]
  "sbo"               => ["SBO:0000176"]
  "metanetx.reaction" => ["MNXR140947"]
  "brenda"            => ["3.4.13.18"]
  "seed.reaction"     => ["rxn12637"]
  "biocyc"            => ["META:RXN0-6987"]
  "ec-code"           => ["3.4.13.18"]

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e830279) 89.18% compared to head (6c9ee73) 89.18%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #788 +/- ## ======================================= Coverage 89.18% 89.18% ======================================= Files 93 93 Lines 2432 2432 ======================================= Hits 2169 2169 Misses 263 263 ``` | [Impacted Files](https://app.codecov.io/gh/LCSB-BioCore/COBREXA.jl/pull/788?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore) | Coverage Δ | | |---|---|---| | [src/types/models/SBMLModel.jl](https://app.codecov.io/gh/LCSB-BioCore/COBREXA.jl/pull/788?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore#diff-c3JjL3R5cGVzL21vZGVscy9TQk1MTW9kZWwuamw=) | `92.08% <100.00%> (ø)` | |

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