Add DeepnoteRenderer to pio.renderers

[jakubzitny]

Adding a dedicated renderer for Deepnote notebooks, similar to ColabRenderer, CoCalcRenderer, or AzureRenderer.

Disclaimer: I am an engineer from Deepnote, we are requesting this after having a number of users of Deepnote misconfiguring renderers in Plotly which lead to broken chart rendering.

• [x] I have read through the contributing notes and understand the structure of the package. In particular, if my PR modifies code of plotly.graph_objects, my modifications concern the codegen files and not generated files.
• [x] I have added tests (if submitting a new feature or correcting a bug) or modified existing tests.
• [x] For a new feature, I have added documentation examples in an existing or new tutorial notebook (please see the doc checklist as well).
• [x] I have added a CHANGELOG entry if fixing/changing/adding anything substantial.
• [x] For a new feature or a change in behaviour, I have updated the relevant docstrings in the code to describe the feature or behaviour (please see the doc checklist as well).

[Coding-with-Adam]

hi @jakubzitny Thanks for starting this PR. I wanted to follow up and encourage you to continue the process. We would love to see this PR completed.