add interface for the viz tool by OMEinsumContractionOrders v0.9

[ArrogantGao]

No description provided.

[ArrogantGao]

The usage is very similar:

julia> using OMEinsum

julia> eincode = ein"abij, jhgk, icdl, klfe -> abcdefgh"
abij, jhgk, icdl, klfe -> abcdefgh

julia> viz_eins(eincode, filename = "a.png")
ERROR: ArgumentError: Extension `LuxorTensorPlot` not loaeded, please load it first by `using LuxorGraphPlot`.
Stacktrace:
 [1] viz_eins(args::OMEinsumContractionOrders.EinCode{Char}; kwargs::@Kwargs{filename::String})
   @ OMEinsumContractionOrders ~/code/OMEinsumContractionOrders.jl/src/visualization.jl:10
 [2] viz_eins(::StaticEinCode{…}; kwargs::@Kwargs{…})
   @ OMEinsum ~/code/OMEinsum.jl/src/contractionorder.jl:41
 [3] top-level scope
   @ REPL[3]:1
Some type information was truncated. Use `show(err)` to see complete types.

julia> using LuxorGraphPlot

julia> viz_eins(eincode, filename = "a.png")

This gives

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.87%. Comparing base (8c07022) to head (8bf84a7).
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@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
- Coverage   88.88%   82.87%   -6.02%     
==========================================
  Files          14       16       +2     
  Lines        1080     1238     +158     
==========================================
+ Hits          960     1026      +66     
- Misses        120      212      +92     

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[GiggleLiu]

Good job!