Add TypeScript type for PostgREST View in `from()` method

[Waffle0823]

TODO: Support PostgREST Views in TypeScript from() method

Goal

Enable type-safe usage of PostgreSQL VIEWs in supabase.from() by adding a View generic type, similar to how Table is handled.

Tasks

• Extend Schema['Views'] to include all relevant database views.
• Add ViewName generic constrained to keyof Schema['Views'].
• Add View generic to represent the selected view's row structure.
• Update from() overloads to accept view names and infer View['Row'] type.
• Add unit tests to verify type inference for view selections.
• Update documentation/examples for type-safe view usage.

Example

supabase
  .from<'active_users'>()
  .select('id, email') // correctly infers { id: number; email: string }[]

Notes

• Views are read-only in most cases; consider handling insert, update, delete appropriately.
• Ensure backward compatibility with existing table handling.