fix: figure_title and chart_title were not mapped up correctly

[mofojed]

• Previously for some reason we were mapping the first subplot chart title to the figure title, which was incorrect. Instead map the Figure title attribute to the figure, and then chart title to the individual subplots
• Annoyingly plotly doesn't have a chart title property, so we need to map these titles to annotations to get it to work correctly
• Fixes Figure().figure_title() does not render a title in the IDE or in Jupyter #1674 , Fixes chart_title doesn't title subplots #1675
• Tested with the following snippet:

from deephaven.plot.figure import Figure
from deephaven import read_csv

insurance = read_csv("https://media.githubusercontent.com/media/deephaven/examples/main/Insurance/csv/insurance.csv")

insurance_by_region = insurance.view(formulas=["region", "expenses"]).avg_by(["region"])
insurance_by_sex = insurance.view(formulas=["sex", "expenses"]).avg_by(["sex"])
insurance_by_children = insurance.view(formulas=["children", "expenses"]).avg_by(["children"]).sort(order_by=["children"])
insurance_by_smoker = insurance.view(["smoker", "expenses"]).avg_by(["smoker"])

insurance_cat_plots = Figure(rows=2, cols=2).\
    new_chart(row=0, col=0).\
    plot_cat(series_name="Region", t=insurance_by_region, category="region", y="expenses").\
    chart_title(title="Average charge ($) by region").\
    new_chart(row=0, col=1).\
    plot_cat(series_name="Sex", t=insurance_by_sex, category="sex", y="expenses").\
    chart_title(title="Average charge ($) by sex").\
    new_chart(row=1, col=0).\
    plot_cat(series_name="Children", t=insurance_by_children, category="children", y="expenses").\
    chart_title(title="Average charge ($) per number of children").\
    new_chart(row=1, col=1).\
    plot_cat(series_name="Smoker", t=insurance_by_smoker, category="smoker", y="expenses").\
    chart_title(title="Average charge ($) smokers vs nonsmokers").\
    chart_legend(visible=False).\
    figure_title("Figure Title").\
    show()

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (ba1d51b) 46.65% compared to head (9ee6592) 46.67%.

Files	Patch %	Lines
packages/chart/src/FigureChartModel.ts	92.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1676      +/-   ##
==========================================
+ Coverage   46.65%   46.67%   +0.02%     
==========================================
  Files         606      606              
  Lines       36852    36873      +21     
  Branches     9255     9267      +12     
==========================================
+ Hits        17192    17211      +19     
- Misses      19608    19610       +2     
  Partials       52       52              

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[dsmmcken]

Previously for some reason we were mapping the first subplot chart title to the figure title, which was incorrect. Instead map the Figure title attribute to the figure, and then chart title to the individual subplots

I think we need to still support this behaviour as that's what our docs said to use, so people have been using chart_title like it was figure_title. Maybe only in the case where figure_title is null or chart_title count == 1 or something.

[mattrunyon]

Looks good. Just want to confirm w/ @dsmmcken that the chart title spacing is good (it's consistent now regardless of panel size)

[dsmmcken]

Spacing is fine