[WIP] Update maven-extension module to follow style guide

[Copilot]

Plan to update maven-extension module to follow style guide

Based on analysis of the style guide and current code, here are the minimal changes needed:

Public Classes That Need final Keyword

• MavenOtelSemanticAttributes - utility class should be final
• AutoConfigureUtil2 - utility class should be final
• MojoGoalExecutionHandlerConfiguration - public class should be final
• MavenResourceProvider - public class should be final
• MavenResourceDetector - public class should be final

Test Classes Visibility

• Remove public from 5 test classes to make them package-protected:
  • OpenTelemetrySdkServiceTest
  • SpanRegistryTest
  • MojoGoalExecutionHandlerTest
  • MojoGoalExecutionHandlerConfigurationTest
  • MavenUtilsTests

Static Imports to Add

• Review files for opportunities to add static imports for commonly used methods (AttributeKey., Assertions., Collections.*, etc.)

Field Finalization

• Review fields that could be declared final

Class Organization

• Verify proper ordering of members (static fields, instance fields, constructors, methods, nested classes)

The plan focuses on minimal changes and follows the principle of making the least invasive modifications possible.

Fixes #397.

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