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

[xJac0b]

Resolves #218

[gemini-code-assist[bot]]

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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