Tutorial for Hamiltonian Block Encoding

[damarkian]

Added a tutorial for Block Encoding a molecular Hamiltonian into a qibo circuit.

Features:

• PREP: Mottonen-complex amplitude encoder from qibo.models.encodings
• SEL: Multi-qubit controlled unitaries from qubit Hamiltonian

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1527b98) to head (9b2dcf2).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #207   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          990       990           
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  Hits           990       990           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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