[Demo] Optional Sync Supabase Todo App

[Chriztiaan]

This adds a demo project that aims to demonstrate how an app could be built starting from a local-only state and later being "upgraded" to a version that has sync capabilities. It started off as a copy of the existing todo app that was stripped of some of the features. It works off the existing react-supabase-todo demo and the optional-sync demo added to the Dart monorepo here.

The readme has a basic description of how everything works, with diagrams to show how the app switches from the local-only mode to sync mode.

Added tests to the web package to confirm that updateSchema works. A refresh schema implementation doesn't seem to be required based on looking at the tests and updating the schema in the demo.

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Latest commit: f5f16b4

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