restore randisometry, add tests and deprecations

[Jutho]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 56.66667% with 13 lines in your changes missing coverage. Please review.

Project coverage is 81.19%. Comparing base (a012324) to head (d95dfd0).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/tensors/tensor.jl	57.14%	9 Missing ⚠️
src/auxiliary/random.jl	55.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
+ Coverage   81.15%   81.19%   +0.03%     
==========================================
  Files          41       41              
  Lines        4999     5003       +4     
==========================================
+ Hits         4057     4062       +5     
+ Misses        942      941       -1     

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[lkdvos]

Looks great to me! I suggested some slight additions to the docstrings to improve discoverability, but otherwise good to go.