[IMPROVEMENT] Add dash app title

[Olivier0330]

Not really a bug, but more of an improvement suggestion.

The tab title of the Dash app will by default always be called 'Dash'.

However, when plotting multiple data sets in different tabs, it would be useful to assign a name to the tab to know which data is shown in which tab (for example when files are plotted).

This can be done by adding a 'title' argument in the show_dash function of the FigureResampler class and assigning 'app.title'

[jonasvdd]

@Olivier0330
If you use the manual mode, you are able to specify the title in the init_dash_kwars argument; see ⬇️

from plotly_resampler import FigureResampler
import plotly.graph_objects as go

fig = FigureResampler(go.Figure())
fig.show_dash(mode='external', port=8012, init_dash_kwargs={'title': 'TEST TITLE'})

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I will close this issue for now.
Kind regards,
Jonas