Implementation of bokeh backend.

[r3kste]

Summary of Changes

1. Added the line_plot and grid_line_plot function for bokeh.
2. Added a small example in the documentation to show a bokeh plot.

Plot Comparision

Plotly	Bokeh

Checklist

• Documentation
• Tests
• Comparision of plot outputs

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/optimagic/config.py	100.00% <100.00%> (ø)
src/optimagic/visualization/backends.py	99.42% <100.00%> (+0.39%)	⬆️
src/optimagic/visualization/convergence_plot.py	95.65% <100.00%> (+0.19%)	⬆️
src/optimagic/visualization/history_plots.py	95.78% <ø> (ø)
src/optimagic/visualization/profile_plot.py	91.52% <ø> (ø)
src/optimagic/visualization/slice_plot.py	96.12% <ø> (ø)

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[timmens]

Looks great, thanks!