🔥 add support for figure dict input + propagate _grid_str

[jvdd]

This PR does;

• support figure as a dict as input for our wrappers (e.g. FigureResampler(fig.to_dict()) with fig a go.Figure)
  => this is in line with the vanilla plotly behavior (see BaseFigure constructor documentation)
• propagate _grid_str in our composable constructors
• test the above

[codecov-commenter]

Codecov Report

Merging #92 (862bc0a) into main (2ed7423) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
+ Coverage   98.12%   98.15%   +0.03%     
==========================================
  Files          10       10              
  Lines         746      759      +13     
==========================================
+ Hits          732      745      +13     
  Misses         14       14              

Impacted Files	Coverage Δ
...tly_resampler/figure_resampler/figure_resampler.py	90.90% <100.00%> (+0.90%)	⬆️
...ler/figure_resampler/figure_resampler_interface.py	99.70% <100.00%> (+<0.01%)	⬆️
...sampler/figure_resampler/figurewidget_resampler.py	99.00% <100.00%> (+0.06%)	⬆️

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