Update min Dart SDK to 3.8.0, update analyzer and custom_lint_builder dependencies

[xJac0b]

Resolves #218

[gemini-code-assist]

Summary of Changes

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This pull request performs essential maintenance by updating core dependencies and the minimum required Dart SDK version. The upgrades to the analyzer and custom_lint_builder packages necessitated several API migrations across the codebase to ensure continued compatibility and to leverage the latest features and stability improvements from these updated analysis tools.

Highlights

• Minimum Dart SDK Update: The minimum required Dart SDK version has been updated to 3.8.0, ensuring compatibility with newer language features and platform improvements.
• Dependency Upgrades: The analyzer package has been upgraded to version 8.1.1 and the custom_lint_builder package to version 0.8.1, bringing the project up-to-date with the latest versions of these critical development tools.
• Analyzer API Migration: Numerous internal API usages related to the analyzer package have been migrated. This includes changing ErrorReporter to DiagnosticReporter, ErrorSeverity to DiagnosticSeverity, and updating references from element2/library2/name2 to their simpler element/library/name counterparts, reflecting breaking changes and improvements in the analyzer package.

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[gemini-code-assist]

Code Review

This pull request updates the minimum Dart SDK version and several dependencies, including analyzer and custom_lint_builder. The changes primarily consist of adapting the codebase to the new APIs introduced by these updated dependencies. This includes migrating from deprecated analyzer APIs (like element2, library2, ErrorReporter) to their current counterparts. The changes are extensive but appear to be correct and necessary for the dependency upgrade. The code formatting has also been improved in many places, which enhances readability. Overall, this is a solid maintenance PR that brings the project up to date with its dependencies.