Add button to pin panels and bars

[reinaldofox]

Add the possibility of pinning bars and panels. So that when a panel is unpinned and when positioning the cursor in the code editor, this panel/bar automatically collapses to display only its title bar, when clicking the show button it returns to normal display.

I think this is a usability issue when writing code, because when you are typing the focus is completely on the code and with other bars and panels collapsed the editing area becomes much larger, and this is very useful for small screens, such as laptop screens.

[vs-code-engineering[bot]]

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Happy Coding!