Add extra spaces while displaying a TensorSpace

[jishnub]

This improves the display of tensor spaces using certain fonts, while being mildly inconvenient in others. This also helps with tab-completion in the REPL, which seems to only work with the extra spaces present.

Before

julia> Chebyshev() ⊗ Chebyshev()
Chebyshev()⊗Chebyshev()

After

julia> Chebyshev() ⊗ Chebyshev()
Chebyshev() ⊗ Chebyshev()

[codecov]

Codecov Report

Base: 71.40% // Head: 71.43% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (93f7fdf) compared to base (45bd192).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #223      +/-   ##
==========================================
+ Coverage   71.40%   71.43%   +0.02%     
==========================================
  Files          77       77              
  Lines        8020     8020              
==========================================
+ Hits         5727     5729       +2     
+ Misses       2293     2291       -2     

Impacted Files	Coverage Δ
src/show.jl	83.20% <100.00%> (ø)
src/Caching/ragged.jl	63.68% <0.00%> (+0.99%)	⬆️

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