[WIP] Switch to Luxor backend

[GiggleLiu]

Does it look better? @Roger-luo

NOTE: the using time is increased a bit because ZX visualization still requires Compose backend.
Maybe we can consider moving YaoPlots to Yao. If we do so, the using time change is:

julia> @time using YaoPlots, Yao  # Luxor backend
  2.702133 seconds (8.88 M allocations: 602.516 MiB, 3.48% gc time, 11.90% compilation time)

compared to

julia> @time using Yao
  2.072055 seconds (7.59 M allocations: 519.156 MiB, 1.30% gc time, 14.47% compilation time)

[codecov]

Codecov Report

Merging #56 (14ff467) into master (f553a60) will increase coverage by 30.11%.
The diff coverage is 81.08%.

@@             Coverage Diff             @@
##           master      #56       +/-   ##
===========================================
+ Coverage   50.75%   80.87%   +30.11%     
===========================================
  Files           4        3        -1     
  Lines         329      298       -31     
===========================================
+ Hits          167      241       +74     
+ Misses        162       57      -105     

Impacted Files	Coverage Δ
src/vizcircuit.jl	80.42% <80.70%> (+13.17%)	⬆️
src/YaoPlots.jl	50.00% <100.00%> (+50.00%)	⬆️
src/helperblock.jl	93.33% <100.00%> (-6.67%)	⬇️

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[ChenZhao44]

I'm considering moving ZX visualization part to ZXCalculus.jl. I will also look into the new backend.

[GiggleLiu]

https://github.com/GiggleLiu/LuxorGraphPlot.jl

Luxor is more actively maintained. This is a frontend that I built for replacing GraphPlot.jl