This PR implements a per-commit benchmarking system for NativeLink inspired by the Lucene Nightly Benchmarks project.

Features:

• Benchmarks for both Rust (rustlings) and C++ (googletest) projects
• Tests remote cache only and remote cache + execution scenarios
• Measures incremental build performance
• Generates visualizations and reports
• Detects performance regressions
• Uses NativeLink cloud service (app.nativelink.com)

Fixes #1700

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

The benchmarking system has been tested locally with the following configuration:

• Rust project (rustlings) for testing remote cache, remote execution, and incremental builds
• C++ project (googletest) for testing remote cache performance
• Integration with NativeLink cloud service (app.nativelink.com)

Checklist

• Updated documentation if needed
• Tests added/amended
• bazel test //... passes locally

/claim #1700

This change is