feat: window-manager with addons

[trulysinclair]

Preflight Checklist

• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

A dedicated Window Manager should serve basic functionality by creating either BrowserWindows or BaseWindows. Additional addons could add necessary functionality incrementally to avoid a monolithic package.

Proposed Solution

• A Window Manager capable of creating BaseWindows and BrowserWindows, keeping track of them and side effects
• A View Addon addon that can create and manage views for windows
• A drag-and-drop addon which handles the DnD of views between windows, and creates new windows under conditions

Alternatives Considered

The old system from the production application, which was messy and broken.

Additional Information

No response