Add Gradle plugin development ArchUnit rules for lazy task registration and Provider API usage with field-specific recommendations

[rpalcolea]

This PR adds two new ArchUnit rules to detect common Gradle plugin development anti-patterns.

The GradlePluginLazyTaskRegistrationRule flags plugins using eager task creation (project.task() or tasks.create()) instead of lazy registration (tasks.register())

The GradleTaskProviderApiRule detects task properties using plain types instead of the Provider API, providing field-specific recommendations (e.g., suggesting RegularFileProperty for File fields with @InputFile, or ListProperty<T> for List fields).