Added Edit Notebook Metadata Option (#6402)

[Dilip-Jain]

Issue No. #6402

Problem

Feature Required: Edit Notebook Metadata option under the Edit Menu (in Notebook) as was in classic notebook.
@jtpio mentions -

Maybe the simplest way for now would be to add a Edit Notebook Metadata command to the menu that would open the Notebook tools panel instead of a dialog.

Solution

Edit Notebook Metadata plugin added under Edit Menu for functionality similar to classic-notebook. Clicking on the option under the menu opens up the Notebook Tools widget in the right sidebar and expands the Additional Tools (which contains the Notebook Metadata editor) collapsible section (default: collapsed).
Fixes #6402

Key Addition [Enhancement]

editNotebookMetadata plugin to add a command to open right sidebar for Editing Notebook Metadata when clicking on "Edit Notebook Metadata" option under Edit menu.

• On the click, the plugin first checks if Show Notebook Tools (Right Sidebar) is open (expanded)
• If not open, toggle the Right Sidebar and expand the Show Notebook Tools.
• Lastly, it expands the 'Advanced Tools' collapsible section (default, collapsed)

Thank you for considering this pull request, and I welcome any feedback or suggestions for further improvements.

[github-actions]

👈 Launch a Binder on branch Dilip-Jain/notebook/edit-notebook-metadata

[Dilip-Jain]

Hey @jtpio,
anything not in place or needs to be altered?
just created another PR for (different) issue 7008, so just checkin' in here..

[jtpio]

FYI @Dilip-Jain I pushed a few commits to fix the menu item, and add the command to the command palette.

[jtpio]

bot please update playwright snapshots

[jtpio]

Thanks!