Added useMutation and useAction APIs

[Addonay]

Overview

This PR introduces two new convenience hooks for the convex-svelte library: useMutation and useAction.

Changes

• Added useMutation hook for easier mutation handling
• Added useAction hook for easier action handling
• Moved Convex files to src/lib/convex/ for better organization
• Added unit tests for the new hooks
• Added e2e tests to verify functionality
• Refactored components for improved reusability

Backward Compatibility

There are no breaking changes. Users can continue to use client.mutation() if they prefer. These new hooks provide a more convenient alternative API.

Testing

Unit tests and e2e tests have been added to verify the new hooks work correctly. Run npm test to verify.

Additional Notes

• Switched to Bun for dependency management (added bun.lock)
• Updated package.json exports configuration
• Updated dependencies to use more later versions.

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