Simplify windowing in graph wrapper structs

[ricopinazo]

What changes were proposed in this pull request?

Why are the changes needed?

Does this PR introduce any user-facing change? If yes is this documented?

How was this patch tested?

Are there any further changes required?

[codecov]

Codecov Report

Merging #165 (366c23f) into main (a65ac18) will increase coverage by 0.22%.
The diff coverage is 36.19%.

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
+ Coverage   70.37%   70.60%   +0.22%     
==========================================
  Files          71       71              
  Lines       10963    10800     -163     
==========================================
- Hits         7715     7625      -90     
+ Misses       3248     3175      -73     

Impacted Files	Coverage Δ
docbrown/src/db/view_api/time.rs	100.00% <ø> (+1.56%)	⬆️
python/src/edge.rs	0.00% <0.00%> (ø)
python/src/vertex.rs	0.00% <0.00%> (ø)
docbrown/src/db/path.rs	10.97% <4.76%> (-1.27%)	⬇️
docbrown/src/db/vertices.rs	16.49% <27.27%> (+0.49%)	⬆️
docbrown/src/db/edge.rs	58.73% <62.50%> (-7.71%)	⬇️
docbrown/src/db/vertex.rs	46.31% <73.07%> (-9.96%)	⬇️
docbrown/src/db/graph_window.rs	61.79% <100.00%> (+1.27%)	⬆️

... and 9 files with indirect coverage changes

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