bidirected graph support in rand_split_edge

[CarloLucibello]

No description provided.

[codecov]

Codecov Report

Merging #71 (a3cd35b) into master (d5c7a80) will increase coverage by 2.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   79.05%   81.51%   +2.45%     
==========================================
  Files          13       13              
  Lines         893      898       +5     
==========================================
+ Hits          706      732      +26     
+ Misses        187      166      -21     

Impacted Files	Coverage Δ
src/GNNGraphs/transform.jl	95.59% <100.00%> (+9.32%)	⬆️
src/GNNGraphs/query.jl	87.80% <0.00%> (+5.54%)	⬆️

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