[local_auth] Switch to new analysis options (flutter#4604)

Removes the legacy analysis options and fixes all violations. Most fixes were automated `dart fix --apply` changes.

Part of flutter/flutter#76229

[shared_preferences] Fix example in readme for mocking values (flutte…

…r#4411)

This fixes the example for mocking values in the readme of shared_preferences.
After the NNBD migration mock values can only be of type Object.

[path_provider] Fix handling of null application ID (flutter#4606)

The lookup of application ID was handling `null` (Dart null), but not
`nullptr` (Dart representation of a C null pointer), so was throwing an
exception in applications without an application ID.

This includes the `shared_preferences_linux` example application, so
this fixes tree breakage.

[in_app-purchase] Updated the ReadMe to remove the deprecated `InAppP…

…urchaseAndroidPlatformAddition.enablePendingPurchases ` method (flutter#4597)

This will resolve flutter/flutter#93837 & this work is just the follow-up from flutter#4527 PR.

We need to update the documentation in the README.md of the in_app_purchase package to remove the instruction of initialization with the deprecated `InAppPurchaseAndroidPlatformAddition.enablePendingPurchases` method.

Fixes flutter/flutter#94977

[in_app_purchase] Fix upgrading subscription by deferred proration mo…

…de on android. (flutter#4560)

This PR is for updating the bug of upgrading subscription by deferred mode on android, the purchaseStream of PurchaseStatus will return error.

Fixes [flutter/flutter#94439]

[webview_flutter] Change import of FLTCookieManager.h to relative imp…

…ort (flutter#4600)

[shared_preferences] Remove platform registration (flutter#4596)

The plugin requires Flutter 2.5, which supports auto-registration of
Dart implementation code in platform packages, and the packages already
do auto-registration. This registration is unused, so can be removed.

Fixes flutter/flutter#81421

[path_provider] Use the application ID in the application support path (

flutter#2845) (flutter#3077)

Use the existing executable named directory if it exists, to allow backwards
compatibility to work.

[webview_flutter] Default Android to hybrid composition (flutter#4576)

Switches the default implemention on Android from virtual display to
hybrid composition. This is a breaking change.

Part of flutter/flutter#93335

[webview_flutter] Proof of concept web implementation (flutter#4594)

Initial proof of concept implementation of flutter_webview for the web.