proposed API: expose sidebar/panel/auxiliaryBar visibility to extensions

[cgaspard]

Fixes #321409

What

Adds vscode.proposed.layoutVisibility.d.ts with three new members on vscode.window:

• isSideBarVisible: boolean — current visibility of the primary sidebar
• isPanelVisible: boolean — current visibility of the bottom panel
• isAuxiliaryBarVisible: boolean — current visibility of the auxiliary bar (secondary sidebar)
• onDidChangeLayoutVisibility — event that fires whenever any of the three change

Why

There is currently no public Extension API to query whether the sidebar, panel, or auxiliary bar are visible. The internal IWorkbenchLayoutService.isVisible() and onDidChangePartVisibility have exactly this information but are not bridged to the extension host.

The context keys sideBarVisible, panelVisible, auxiliaryBarVisible exist and are kept in sync internally, but extensions can only use them in declarative when clauses — they cannot be read at runtime.

Impact

Any extension that manages workbench layout (focus modes, maximize/restore, presentation modes, Zen-like toggles) hits this gap. The only current workaround is to parse VS Code's internal state.vscdb SQLite file directly — which is stale mid-session and relies on undocumented storage keys.

Implementation notes

The proposed .d.ts file is provided here. The implementation would bridge IWorkbenchLayoutService.isVisible("workbench.parts.sidebar/panel/auxiliarybar") and onDidChangePartVisibility from the renderer to the extension host — similar to how window.state (focused, active) is currently bridged.

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