Add dispose to FutureProvider

[RossComputerGuy]

This is useful for disposing data which was created in a future provider.

Summary by CodeRabbit

• New Features
  • Added an optional parameter to support custom disposal logic in the FutureProvider widget, enabling better resource cleanup when the provider is removed.

[coderabbitai[bot]]

Walkthrough

The FutureProvider constructor in the async provider library was updated to accept an optional dispose parameter, which is forwarded to the superclass DeferredInheritedProvider. The disposal logic in DeferredInheritedProvider was modified to handle disposal differently when the provided type is a Future, deferring disposal until the future completes. No other logic or control flow changes were made.

Changes

File(s)	Change Summary
packages/provider/lib/src/async_provider.dart	Added optional dispose parameter to FutureProvider constructor and passed it to superclass.
packages/provider/lib/src/deferred_inherited_provider.dart	Changed dispose parameter and field type from Dispose<T>? to Dispose<R>?; modified disposal logic to defer disposal until future completes when T is Future<R>.

Poem

A tweak to how providers close,
Now dispose can guide the flows.
With care, async dreams unwind,
As rabbits code and futures bind.
A gentle hop, a tidy end—
To every future, now a friend! 🐇✨

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