Test: finalized editor/lineNumber/context menu API proposal

[joyceerhl]

Refs: #175945

• anyOS @rebornix
• anyOS @joaomoreno

Complexity: 2

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This milestone, we've finalized the editor/lineNumber/context menu API proposal. This exposes a context menu anchored to the editor line number/gutter area.

Testing: Please create an extension which contributes a command to the editor/lineNumber/context menu and verify the usability of this context menu for extension-contributed commands. Today we expose the target line number in an argument passed to the extension command, as well as in a context key editorLineNumber which can be referenced in the contribution's when clause. Also verify that you do not need to enable a proposed API for your commands to show up in the context menu, and that there are no errors/warnings about API proposals in the developer tools console.