Add command to open terminal in new window

[Copilot]

This PR adds a new VS Code command workbench.action.terminal.newInNewWindow that creates a new terminal directly in a new window, complementing the existing "Move Terminal into New Window" command that moves existing terminals.

What's new

Command: "New Terminal in New Window"

• ID: workbench.action.terminal.newInNewWindow
• Keyboard shortcut: Ctrl+Shift+Alt+`` (Windows/Linux), Cmd+Ctrl+Shift+Alt+`` (macOS)
• Available in: Command Palette (F1)

Behavior

When executed, the command:

1. Creates a new terminal instance
2. Opens it directly in a new auxiliary window (separate from the main VS Code window)
3. Automatically focuses the terminal for immediate use

Implementation details

The implementation follows established VS Code patterns:

• Uses AUX_WINDOW_GROUP constant to open the terminal in a new window
• Includes proper preconditions (TerminalContextKeys.processSupported or webExtensionContributedProfile)
• Added to DEFAULT_COMMANDS_TO_SKIP_SHELL list for proper shell integration
• Follows the same action registration pattern as other terminal creation commands

Files changed

• src/vs/workbench/contrib/terminal/common/terminal.ts - Added command ID enum and skip shell entry
• src/vs/workbench/contrib/terminal/common/terminalStrings.ts - Added localized string
• src/vs/workbench/contrib/terminal/browser/terminalActions.ts - Implemented action with keybinding

Command comparison

• "New Terminal": Creates terminal in current window
• "Move Terminal into New Window": Moves existing terminal to new window
• "New Terminal in New Window" ⭐: Creates NEW terminal directly in new window

This provides users with a more direct workflow for creating terminals in separate windows without having to first create a terminal and then move it.

Fixes #258895.

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