improve visualizations in lab_dev

[timmysilv]

Context:
There have been some issues with visualizations in MrMustard, and this should address a good amount of them

Description of the Change:

• Remove mako-based implementations for _repr_html_, and replace them with ipywidgets-based implementations with _ipython_display_. I mainly did this because ipywidgets is easier to work with than raw HTML, and should be more portable (eg. jupyterlab vs VS Code). Also, the switch to _ipython_display_ allows for side-effects, and doesn't also print the default repr (unless I do it explicitly)
• Simplified the funky HTML+CSS to a consistent and basic look. Easier to update, and not distracting at all.
• fix the default return_fig=False option for State.visualize_*() methods by not converting to HTML manually
• some little things to please codefactor

Benefits:

• Works everywhere!
• Easier to maintain
• Uses highly trusted ipywidgets package
• No more double-repr

Possible Drawbacks:

• N/A

Related GitHub Issues:
Fixes #423

[codecov]

Codecov Report

Attention: Patch coverage is 96.62162% with 5 lines in your changes missing coverage. Please review.

Project coverage is 88.31%. Comparing base (c61ac1d) to head (c3bc331).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #425      +/-   ##
===========================================
+ Coverage    88.15%   88.31%   +0.16%     
===========================================
  Files           80       82       +2     
  Lines         6542     6669     +127     
===========================================
+ Hits          5767     5890     +123     
- Misses         775      779       +4     

Files	Coverage Δ
mrmustard/lab_dev/circuit_components.py	95.77% <100.00%> (+0.15%)	⬆️
mrmustard/lab_dev/wires.py	99.12% <100.00%> (+0.84%)	⬆️
mrmustard/physics/representations.py	99.54% <100.00%> (+0.01%)	⬆️
mrmustard/widgets/css.py	100.00% <100.00%> (ø)
mrmustard/widgets/__init__.py	98.13% <98.13%> (ø)
mrmustard/lab_dev/states/base.py	95.98% <40.00%> (-0.86%)	⬇️

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[ziofil]

very nice! thanks :)

[ziofil]

👍