Modify models.encodings.hamming_weight_encoder to upload data in the lexicographical order

[renatomello]

Data is amplitude-encoded in the lexicographical order instead of the order of the original Gray code.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.66%. Comparing base (66b1a0f) to head (cf99513).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1572   +/-   ##
=======================================
  Coverage   99.66%   99.66%           
=======================================
  Files          76       76           
  Lines       11440    11445    +5     
=======================================
+ Hits        11402    11407    +5     
  Misses         38       38           

Flag	Coverage Δ
unittests	99.66% <100.00%> (+<0.01%)	⬆️

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