Remove RandomMatrices as a dependency

[apkille]

It looks like RandomMatrices is only used in this package to generate Haar distributed unitary matrices within the methods randstate_haar and randunitary_haar. This PR implements a slightly faster algorithm that roughly halves the number of allocations and gets rid of RandomMatrices as a dependency.

Before:

julia> for i in 10:10:50
          b = SpinBasis(i)
          @btime randunitary_haar($b)
       end
  25.125 μs (41 allocations: 64.75 KiB)
  88.458 μs (41 allocations: 233.47 KiB)
  192.958 μs (41 allocations: 479.50 KiB)
  415.917 μs (41 allocations: 813.44 KiB)
  638.834 μs (41 allocations: 1.21 MiB)

After:

julia> for i in 10:10:50
           b = SpinBasis(i)
           @btime randunitary_haar($b)
       end
  23.958 μs (23 allocations: 49.94 KiB)
  84.666 μs (23 allocations: 179.42 KiB)
  185.708 μs (23 allocations: 361.56 KiB)
  397.792 μs (23 allocations: 606.28 KiB)
  598.959 μs (23 allocations: 913.59 KiB)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.08%. Comparing base (bb71f52) to head (81c1105).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   93.00%   93.08%   +0.07%     
==========================================
  Files          25       26       +1     
  Lines        3104     3267     +163     
==========================================
+ Hits         2887     3041     +154     
- Misses        217      226       +9     

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[Krastanov]

huh... who would have thought that RandomMatrices is not already excessively optimized.

Do you mind also checking if qr! makes things even faster?

Either way, this is great -- it also removes the transitive dependency on a bunch more packages. Should be merged pretty soon

[apkille]

huh... who would have thought that RandomMatrices is not already excessively optimized.

Yeah, I was surprised by this too. I was planning on using RandomMatrices for Gabs but was shocked by the number of allocations it was producing. It also seems like RandomMatrices has been dealing with a maintenance issue for quite a while...

Do you mind also checking if qr! makes things even faster?

Checked same benchmark as before and qr! gives nearly the same exact speed with a few less allocations, so I made the change.