Trying to remove layout

[ChenZhao44]

In this PR, I try to generate ZXLayout only when it is needed (plotting, converting ZXDiagram to circuits).

[codecov[bot]]

Codecov Report

Merging #77 (c0ce0e0) into master (69a5b5c) will increase coverage by 2.83%. The diff coverage is 96.80%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
+ Coverage   90.93%   93.76%   +2.83%     
==========================================
  Files          11       11              
  Lines        1654     1749      +95     
==========================================
+ Hits         1504     1640     +136     
+ Misses        150      109      -41     

Impacted Files	Coverage Δ
src/circuit_extraction.jl	94.82% <ø> (ø)
src/zx_layout.jl	93.75% <50.00%> (-0.37%)	:arrow_down:
src/ir.jl	88.00% <90.90%> (+12.86%)	:arrow_up:
src/abstract_zx_diagram.jl	97.14% <97.14%> (+97.14%)	:arrow_up:
src/zx_graph.jl	95.20% <98.55%> (+2.49%)	:arrow_up:
src/zx_diagram.jl	96.83% <100.00%> (-0.85%)	:arrow_down:

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[Roger-luo]

cool, this looks much better! but I'm thinking maybe we should re-think about the layouts and integrate things with Quon, so they can share some implementation and move the plotting related code in seperate package (persumably just YaoPlots), to reduce the core functionality here.

[ChenZhao44]

I will merge it first after all tests passing. @Roger-luo

[Roger-luo]

need to have some more tests, the testcov is not happy

[ChenZhao44]

need to have some more tests, the testcov is not happy

The PR will increase codecov now.