[WIP] Update consistent-sampling module to follow style guide

[Copilot]

Style Guide Compliance Updates for Consistent-Sampling Module

Initial analysis of the consistent-sampling module to identify areas that need updating according to the style guide.

Plan:

• Analyze current module structure and identify areas for improvement
• Update @autoservice annotations for SPI implementations
• Review and apply final keyword usage according to style guide rules
• Check and update static import patterns
• Validate class organization (field ordering, method ordering)
• Review @nullable annotation usage
• Ensure minimal visibility modifiers
• Run tests and formatting checks

Key Findings:

• Module has two packages: consistent56 (newer) and consistent (older)
• Manual SPI registration exists for ParentBasedConsistentProbabilitySamplerProvider
• Several public classes that should be reviewed for final usage
• Test classes appear to follow current patterns
• Code formatting is already correct (spotlessCheck passes)

Fixes #246.

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