Improve efficiency of generation of Bloch-Redfield tensor and fix documentation typos

[albertomercurio]

Checklist

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Description

The current implementation of the bloch_redfield_tensor function rotates the basis at the end. This is very inefficient as the rotation superoperator is a large dense matrix.

In this PR, I rotate the basis (if asked) directly during the computation. Avoiding to define the rotation operator. This surely improves the fock_basis=false case, and partially improves the true case.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.08%. Comparing base (bc76e9f) to head (d565a3b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #509      +/-   ##
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+ Coverage   94.05%   94.08%   +0.03%     
==========================================
  Files          51       51              
  Lines        3513     3533      +20     
==========================================
+ Hits         3304     3324      +20     
  Misses        209      209              

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