Add Clifford+T decomposition to transpiler

[renatomello]

Per title. Relies on pygridsynth. This unlocks work related to error correction, as discussed in person @qumaciel @scarrazza @stefanopisoni.

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 99.51%. Comparing base (8020ccc) to head (cd84b88).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1786   +/-   ##
=======================================
  Coverage   99.50%   99.51%           
=======================================
  Files          79       79           
  Lines       13144    13208   +64     
=======================================
+ Hits        13079    13144   +65     
+ Misses         65       64    -1     

Flag	Coverage Δ
unittests	99.51% <100.00%> (+<0.01%)	⬆️

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