Redesign framework for indexing

[KeitaNakamura]

No description provided.

[codecov-io]

Codecov Report

Merging #5 (3b2bf73) into main (0a077f1) will decrease coverage by 1.35%.
The diff coverage is 88.19%.

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
- Coverage   88.57%   87.21%   -1.36%     
==========================================
  Files           9       10       +1     
  Lines         525      532       +7     
==========================================
- Hits          465      464       -1     
- Misses         60       68       +8     

Impacted Files	Coverage Δ
src/Tensorial.jl	100.00% <ø> (ø)
src/symmetry.jl	61.11% <72.72%> (-3.18%)	⬇️
src/indexing.jl	88.63% <82.75%> (-5.20%)	⬇️
src/size.jl	88.00% <88.00%> (ø)
src/tensor.jl	94.68% <88.88%> (-0.47%)	⬇️
src/ad.jl	89.47% <100.00%> (ø)
src/ops.jl	100.00% <100.00%> (ø)

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