Rename Size to Space to avoid conflict with StaticArrays

[KeitaNakamura]

No description provided.

[codecov-io]

Codecov Report

Merging #25 (0cd4d1b) into main (7f1921c) will not change coverage.
The diff coverage is 89.02%.

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files          12       12           
  Lines         698      698           
=======================================
  Hits          625      625           
  Misses         73       73           

Impacted Files	Coverage Δ
src/Symmetry.jl	60.00% <0.00%> (ø)
src/Tensorial.jl	100.00% <ø> (ø)
src/AbstractTensor.jl	93.75% <83.33%> (ø)
src/Space.jl	87.50% <87.50%> (ø)
src/Tensor.jl	97.11% <100.00%> (ø)
src/ad.jl	89.47% <100.00%> (ø)
src/indexing.jl	88.37% <100.00%> (ø)
src/ops.jl	99.56% <100.00%> (ø)
src/simd.jl	100.00% <100.00%> (ø)
src/utils.jl	100.00% <100.00%> (ø)
... and 1 more

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