Feature/double named dominance edges in index update

[MartinKl]

This implements doubling named dominance edges into the default dominance component after performing a graph update. Doubling of edges takes place in AnnotationComponentType::apply_update_graph_index.

This might require benchmarking, I leave this to you @thomaskrause

[github-actions]

Commit a47fdd6

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Diff: origin/main...HEAD, staged and unstaged changes
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graphannis/src/annis/db/aql/model.rs (100%)
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[thomaskrause]

I did change some things to make it more consistent with previous relANNIS behavior, e.g. the edges are only added if there is no other unnamed dominance component in another layer.

I also added a benchmark to check that that performance is not negativly impacted and overall this looks good to me. I will have to run the search tests/benchmarks with the newly imported corpora to check that the results are actually the same even after re-importing the corpora using the new code.