renaming cma function

[scarrazza]

Closes #381. @DiegoGM91 could you please confirm this solves the ambiguity?

[codecov]

Codecov Report

Merging #383 (78314bc) into master (cbb846e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #383    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           77        77            
  Lines        12454     12196   -258     
==========================================
- Hits         12454     12196   -258     

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

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/qibo/optimizers.py	100.00% <100.00%> (ø)
src/qibo/solvers.py	100.00% <0.00%> (ø)
src/qibo/core/gates.py	100.00% <0.00%> (ø)
src/qibo/core/states.py	100.00% <0.00%> (ø)
src/qibo/core/circuit.py	100.00% <0.00%> (ø)
src/qibo/core/callbacks.py	100.00% <0.00%> (ø)
src/qibo/models/circuit.py	100.00% <0.00%> (ø)
src/qibo/tests/test_hep.py	100.00% <0.00%> (ø)
src/qibo/tests/test_qft.py	100.00% <0.00%> (ø)
src/qibo/backends/einsum.py	100.00% <0.00%> (ø)
... and 39 more

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[DiegoGM91]

@scarrazza this removes the ambiguity, yes.

But I still think that a sentence in the documentation may be in place, e.g. saying that one first needs to import cma to be able to see the CMAOptions.