[WIP] Update samplers module to follow style guide

[Copilot]

Update samplers module to follow style guide

Analysis of the samplers module against the style guide requirements:

• Analyze existing code structure and identify style guide violations
• Verify that tests pass and build is successful
• Confirm errorprone conventions are already applied via otel.java-conventions plugin
• Check formatting with spotless (no issues found)
• Verify test classes are package-protected (already compliant)

Style Guide Issues Identified:

• LinksParentAlwaysOnSamplerProvider: Missing @AutoService annotation and should be final
• Missing static imports: Some static imports could be added for better consistency (requireNonNull is correctly static imported)
• Field ordering: Verify all classes follow preferred field ordering (static final, instance final, etc.)

Minimal Changes Required:

• Add @AutoService annotation to LinksParentAlwaysOnSamplerProvider
• Make LinksParentAlwaysOnSamplerProvider final
• Review and verify field/method ordering in all classes
• Run spotlessApply to ensure formatting compliance
• Verify tests still pass after changes

Fixes #228.

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