Rewrite special-purpose constructors to use in-place operations

[lkdvos]

Refactor special-purpose constructors to utilize in-place implementations instead:

t = zeros(ComplexSpace(2), ComplexSpace(2))
unitary!(t)

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.64%. Comparing base (9bd4c40) to head (67f6dc5).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/tensors/linalg.jl	92.85%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #232   +/-   ##
=======================================
  Coverage   82.63%   82.64%           
=======================================
  Files          43       43           
  Lines        5557     5559    +2     
=======================================
+ Hits         4592     4594    +2     
  Misses        965      965           

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[Jutho]

Looks good except for the comment/question.

[lkdvos]

Good catch, thanks!
At some point we should maybe also normalize our error messages here as well.
I'm still not sure if we want to use lazy everywhere, include information, or not, and it seems like we still have SectorMismatch and SpaceMismatch both being used for similar things in certain locations.