Allow browser tab title to be set

[Dr-Irv]

By default, if running a python script and doing fig.show(), there is no way to control the title of the browser window/tab.

Ideally, you'd be able to inject a <title>MYTITLE</title> into the generated HTML via some parameter.

I found a way to hack it and posted an answer in StackOverflow here: https://stackoverflow.com/a/73807264/1970354

But it would be nice if this was generalized and supported directly by plotly.