refactor(platform_interface): replace Flutter UI and foundation imports with package:meta

[kevmoo]

Cleans up superficial Flutter UI (material.dart, cupertino.dart) and foundation.dart imports across *_platform_interface packages in favor of package:meta/meta.dart.

Changes

• UI Framework Cleanups:
  • Replace accidental package:flutter/material.dart and package:flutter/cupertino.dart imports in cloud_firestore_platform_interface, firebase_remote_config_platform_interface, and firebase_performance_platform_interface with package:meta/meta.dart.
  • Remove redundant package:flutter/material.dart imports in firebase_storage_platform_interface and firebase_crashlytics_platform_interface (which already imported package:meta).
• Data Model Cleanups:
  • Replace package:flutter/foundation.dart in pure data models (Blob, FieldPath, GeoPoint, Timestamp, ActionCodeSettings) with package:meta/meta.dart for @immutable, @visibleForTesting, and @protected.
  • Define standalone _kIsWeb in Settings (cloud_firestore_platform_interface) to eliminate foundation.dart dependency.

Verification

• All unit and platform interface tests pass 100% locally across modified packages:
  • cloud_firestore_platform_interface: 46/46 passed
  • firebase_auth_platform_interface: 181/181 passed
  • firebase_storage_platform_interface: 58/58 passed
  • firebase_crashlytics_platform_interface: 33/33 passed
  • firebase_remote_config_platform_interface: 11/11 passed
  • firebase_performance_platform_interface: 65/65 passed

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[kevmoo]

/gemini review

[gemini-code-assist]

Code Review

This pull request removes Flutter-specific dependencies (such as foundation, material, and cupertino) from various Firebase platform interface packages, replacing them with 'package:meta/meta.dart' to decouple them from the Flutter framework. In 'settings.dart', a local '_kIsWeb' constant is introduced to replace 'kIsWeb'. The feedback suggests optimizing the '_kIsWeb' definition by using 'identical(0, 0.0)' instead of 'bool.fromEnvironment', which avoids the need for a lint suppression comment.