refactor: fix impure state updates in DiagramContext and extract useD…

[MOHITKOURAV01]

Title: Refactor DiagramContext and Workspace to fix state management bugs

Description:
This PR addresses issue #737 by refactoring DiagramContext and Workspace to improve state management and code maintainability.

Changes:

1. Fixed Impure State Updates in DiagramContext:

   • Moved side effects (like setUndoStack) out of state setter callbacks (setTables, setRelationships) to prevent impure updates and potential double-invocations in Strict Mode.
   • Memoized the context value using useMemo to prevent unnecessary re-renders of consuming components.

2. Extracted Logic to useDiagramIO Hook:

   • Created a new hook src/hooks/useDiagramIO.js to encapsulate the complex logic for loading, saving, and autosaving diagrams.
   • This separates data persistence concerns from the UI layout in Workspace.jsx.

3. Refactored Workspace.jsx:

   • Simplified the component to focus primarily on layout and composition, delegating data management to useDiagramIO.

Fixes: #737

Type of Change:

• Bug fix (non-breaking change which fixes an issue)
• Refactoring (no functional changes, no api changes)

How Has This Been Tested?

• Manual verification of diagram operations (add/remove tables, relationships).
• Verified Undo/Redo functionality works correctly.
• Verified Save/Load functionality works as expected.

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