change storage to Dict

[ChenZhao44]

No description provided.

[Roger-luo]

CI is not pass, we should just remove the dependency of Multigraph for now, since we are going to make a custom one for fast development

[Roger-luo]

I think you forget to remove Multigraph in tests. And one small comment on this: usually we should use a separate PR to remove things like deps, files etc. so it appears in the PR review process more clearly.

[codecov]

Codecov Report

Merging #9 into master will decrease coverage by 18.23%.
The diff coverage is 57.57%.

@@             Coverage Diff             @@
##           master       #9       +/-   ##
===========================================
- Coverage   38.98%   20.74%   -18.24%     
===========================================
  Files           9        8        -1     
  Lines         531      429      -102     
===========================================
- Hits          207       89      -118     
- Misses        324      340       +16     

Impacted Files	Coverage Δ
src/Multigraphs/multigraph_adjlist.jl	57.83% <ø> (+57.83%)	⬆️
src/ZX.jl	100.00% <ø> (ø)
src/zx_graph.jl	0.00% <ø> (-70.00%)	⬇️
src/zx_diagram.jl	46.55% <57.57%> (-12.38%)	⬇️
src/rules.jl	0.00% <0.00%> (-84.36%)	⬇️
src/Multigraphs/multiple_edge.jl	19.35% <0.00%> (+19.35%)	⬆️
src/Multigraphs/abstract_multigraph.jl	23.33% <0.00%> (+23.33%)	⬆️

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