Return `Samples` type instead of a matrix

[GiggleLiu]

Returning samples as a matrix is not intuitive, so I returned the a Samples instance instead. Since this is an API change, I bumped the middle version number.

I will merge and tagged it directly if the tests pass, since I need to deliver a lecture on Tursday.

[codecov[bot]]

Codecov Report

Merging #60 (439af41) into main (499316d) will decrease coverage by 0.05%. The diff coverage is 82.35%.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   81.66%   81.61%   -0.05%     
==========================================
  Files          10       10              
  Lines         518      533      +15     
==========================================
+ Hits          423      435      +12     
- Misses         95       98       +3     

Files Changed	Coverage Δ
src/TensorInference.jl	100.00% <ø> (ø)
src/generictensornetworks.jl	90.90% <66.66%> (-9.10%)	:arrow_down:
src/sampling.jl	97.59% <80.00%> (-1.16%)	:arrow_down:
src/Core.jl	51.66% <100.00%> (+5.37%)	:arrow_up:

[GiggleLiu]

I need to get it merged for tomorrows' tutorial.