Return `Array` if tensor not given in `@Tensor`

[KeitaNakamura]

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (19bbf2f) 92.18% compared to head (5d7073b) 92.13%.

Files	Patch %	Lines
src/Space.jl	83.33%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
- Coverage   92.18%   92.13%   -0.05%     
==========================================
  Files          19       19              
  Lines        1599     1602       +3     
==========================================
+ Hits         1474     1476       +2     
- Misses        125      126       +1     

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