Molecule preview button and fast plotting

[raunakkbanerjee]

Description of work

Added molecule preview button which, on clicking, creates a window with a 3d view of the selected molecule.
Added fast plotting functionality, on double clicking the file under plot creator tab creates a new plot under plot holder tab. The dataset with main tag is plotted with solid line and dataset with partial and main tag is plotted with dashed line.

To test

Molecule preview can tested by selecting a job like angular correlation under the actions tab after using a trajectory with multiple molecules
Fast plotting can be tested by selecting a .mda file for plotting under the plot creator file and double clicking the file creates a new plot under plot holder tab.

[ChiCheng45]

We'll need to update the pyproject.toml and add pyqt3d as a dependency. @MBartkowiakSTFC I guess we should add PyQt6-3D since PyQt6<=6.7.0 is in the pyproject.toml.

[MBartkowiakSTFC]

Overall, something seems to be missing in this PR. My MoleculeWidget does not get created, with the error:

Traceback (most recent call last):
  File "Src/MDANSE_GUI/Tabs/Visualisers/Action.py", line 223, in update_panel
    input_widget = widget_class(parent=self, **ddict)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "Src/MDANSE_GUI/InputWidgets/MoleculeWidget.py", line 41, in __init__
    ].chemical_system.unique_molecule_names
                      ^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'ChemicalSystem' object has no attribute 'unique_molecule_names'. Did you mean: 'unique_molecules'

[ChiCheng45]

Fast plotting seems to work great. Just one thing, when you double click you also end up opening the drop-down. Maybe this could be changed so that the fast plotting can be added to right click menu to avoid this issue?