Reorganize into files

[mtfishman]

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[codecov]

Codecov Report

Attention: Patch coverage is 45.66929% with 69 lines in your changes missing coverage. Please review.

Project coverage is 34.30%. Comparing base (e1b953a) to head (6766ad9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/index.jl	46.37%	37 Missing ⚠️
src/abstractitensor.jl	44.82%	32 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   34.30%   34.30%           
=======================================
  Files           2        4    +2     
  Lines         172      172           
=======================================
  Hits           59       59           
  Misses        113      113           

Flag	Coverage Δ
docs	33.33% <44.88%> (ø)

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