Refactor module architecture: services, DI, config schema, packaging

Alex Urevick-Ackelsbergrequested to merge
issue/ai_google_analytics-3585748:3585748-add-unit-tests into 1.0.x
  • Extract GoogleAnalyticsCronService from procedural hook code
  • Add BenchmarkEvaluator service for deterministic metric evaluation
  • Introduce services.yml with proper dependency injection
  • Add config schema and default settings configuration
  • Add install/uninstall hooks for clean lifecycle management
  • Refactor controller, settings form, hooks, and plugin for DI
  • Add composer.json for drupal.org packaging
  • Add README.md with installation and configuration docs
  • Update analytics_monitoring_agent config
  • Move procedural code from .module to Hook attribute classes

Closes #3585748

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