Add conversion between ITensorNetwork and Ansatz

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[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.53%. Comparing base (393f727) to head (4924e33).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/TenetITensorNetworksExt.jl	86.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #305       +/-   ##
===========================================
+ Coverage   65.20%   84.53%   +19.33%     
===========================================
  Files          36       36               
  Lines        2371     2386       +15     
===========================================
+ Hits         1546     2017      +471     
+ Misses        825      369      -456     

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