Add CUDA example of tensor network contraction

[Todorbsc]

No description provided.

[mofeing]

@Todorbsc only one thing, the

@benchmark CUDA.@sync contract(tn; path)

doesn't need the CUDA.@sync.

Everything else is fine.

[jofrevalles]

👍

[Todorbsc]

Done! If everything's fine now, feel free to merge it.

[mofeing]

@Todorbsc you need to add the packages to the Project.toml inside examples/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.07%. Comparing base (5ee9b93) to head (4be25b7).
Report is 25 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #154       +/-   ##
===========================================
- Coverage   68.76%   51.07%   -17.69%     
===========================================
  Files          19       19               
  Lines        1050     1065       +15     
===========================================
- Hits          722      544      -178     
- Misses        328      521      +193     

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