Add title to TabbedInterface

[MohamedAliRashad]

Fixes: #2882

[abidlabs]

Thanks for opening the PR @MohamedAliRashad. This change passes a title into parent of TabbedInterface, which is Blocks. If you look at the docstring for Blocks, the effect of this change will be to set a title which appears as the "The tab title to display when this is opened in a browser window."

I believe that you would also like the title to appear above the tabs (which I agree is a good idea). For that, you should add a couple of lines after with self, similar to which appear in the class Interface:

if title:
    Markdown(
        "<h1 style='text-align: center; margin-bottom: 1rem'>"
        + title
        + "</h1>"
    )

[abidlabs]

Make sure to add the change to the CHANGELOG.md file so we can credit you too!

[abidlabs]

LGTM thanks for the contribution to the library @MohamedAliRashad!