Reorganize the template code so it is organized as a package

[mtfishman]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.59%. Comparing base (91829bd) to head (7f8c01d).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ITensorPkgSkeleton.jl	95.45%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   89.53%   88.59%   -0.94%     
==========================================
  Files           1        1              
  Lines          86      114      +28     
==========================================
+ Hits           77      101      +24     
- Misses          9       13       +4     

Flag	Coverage Δ
docs	84.40% <95.45%> (+0.45%)	⬆️

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