Utility and Quality of life for VectorSpaces

[lkdvos]

This PR adds some missing constructors for ComplexSpace and CartesianSpace with generators, and refactors some small pieces of code that were being used for permuting and manipulating spaces to be in one place.

Additionally, it cleans up some of the space checks, and adds missing @inbounds annotations for the add_***_kernels, which avoids a couple hash calls in the getindex for the fusion trees I think.

[codecov]

Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 81.44%. Comparing base (370dd92) to head (424d4fe).

Files	Patch %	Lines
src/tensors/indexmanipulations.jl	72.72%	3 Missing ⚠️
src/spaces/cartesianspace.jl	0.00%	1 Missing ⚠️
src/spaces/complexspace.jl	0.00%	1 Missing ⚠️
src/spaces/vectorspaces.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
- Coverage   81.46%   81.44%   -0.02%     
==========================================
  Files          42       42              
  Lines        5588     5588              
==========================================
- Hits         4552     4551       -1     
- Misses       1036     1037       +1     

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