Renaming and moving things around to match architecture

[apchytr]

Context: Offline discussion has made it apparent that certain objects within lab_dev (such as Circuit) should be renamed and grouped together to reflect the architectural decisions we're making. Circuits now should refer to a future 'Circuit' layer and what is currently in lab_dev is the 'Computational Graph' layer.

Description of the Change: Renamed circuits.py to computational_graph.py, circuit_components.py to graph_component.py. Moved graph_component.py, branch_and_bound.py and computational_graph.py to a computational_graphs folder. Renamed Circuit to ComputationalGraph, GraphComponent to LightGraphComponent, CircuitComponent to GraphComponent. Updated docs to reflect these changes.

Benefits: Makes things clearer

Possible Drawbacks: Since lab_dev has been around for so long people have most likely gotten used to terms such as CircuitComponent, Circuit, etc so there will be an adjustment period.

[apchytr]

Would love to hear people's opinion on what we should actually name things. Perhaps computational_graph is better?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.05%. Comparing base (5a11703) to head (ce2aca9).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #539   +/-   ##
========================================
  Coverage    90.05%   90.05%           
========================================
  Files          102      103    +1     
  Lines         6222     6223    +1     
========================================
+ Hits          5603     5604    +1     
  Misses         619      619           

Files with missing lines	Coverage Δ
mrmustard/lab_dev/__init__.py	100.00% <100.00%> (ø)
mrmustard/lab_dev/computational_graphs/__init__.py	100.00% <100.00%> (ø)
...d/lab_dev/computational_graphs/branch_and_bound.py	93.00% <100.00%> (ø)
...ab_dev/computational_graphs/computational_graph.py	94.93% <100.00%> (ø)
...rd/lab_dev/computational_graphs/graph_component.py	98.44% <100.00%> (ø)
...rmustard/lab_dev/graph_component_utils/__init__.py	100.00% <ø> (ø)
mrmustard/lab_dev/graph_component_utils/b_to_ps.py	100.00% <ø> (ø)
mrmustard/lab_dev/graph_component_utils/b_to_q.py	100.00% <ø> (ø)
...mustard/lab_dev/graph_component_utils/trace_out.py	100.00% <100.00%> (ø)
mrmustard/lab_dev/samplers.py	98.91% <100.00%> (ø)
... and 8 more

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