Add some Love to WidgetMatcher

[passsy]

• Export MultiWidgetMatcher correctly
• Move into a separate file
• Add API tests
• Allow a widgetProp/elementProp to return null

Summary by CodeRabbit

• Refactor
  • Reorganized widget matching and assertion functionalities across several files to improve code organization and usability.
• New Features
  • Introduced new classes and extensions for more precise widget, element, and render object matching and assertions in Flutter testing.
• Tests
  • Added tests to validate the functionality of the newly introduced widget matching and assertion features.

[coderabbitai[bot]]

Walkthrough

The changes encompass a restructuring of widget matching and assertion functionalities in a Flutter testing framework. This overhaul involves relocating WidgetMatcher declarations, eliminating specific matchers and extensions, and introducing enhanced testing capabilities for widgets. These adjustments aim to streamline the process of asserting on widgets, elements, and render objects, thereby improving the efficiency and usability of the testing framework.

Changes

Files	Change Summary
lib/spot.dart	Reorganized WidgetMatcher declarations into widget_matcher.dart; removed MultiMatchers, WidgetMatcherExtensions.
lib/src/spot/.../diagnostic_props.dart, lib/src/spot/snapshot.dart	Added/removed import statements for better organization.
lib/src/spot/selectors.dart	Overhauled widget matching, properties checking, and multi-widget matching classes and extensions.
lib/src/spot/widget_matcher.dart, test/selectors/widget_matcher_test.dart	Introduced WidgetMatcher and MultiWidgetMatcher functionality along with corresponding tests.

🐰✨
In the land of code and Flutter,
Changes come, some soft, some utter.
Matchers move, and widgets find,
A better spot, with tests aligned.
🌟🐾

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