Update benchmarks

[avoidwork]

• Fixing performance benchmarks to log results
• Updating performance benchmarks with missing methods, using 10k iterations
• Refining benchmarks for perf: optimize entries, keys, and values methods #386

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🤖 Augment PR Summary

Summary: Refreshes the benchmark suite to consistently print performance results and expand coverage of the tiny-lru API.

Changes:

• Removes the PerformanceObserver/performance.timerify()-based profiler and standardizes timing on a CustomTimer using performance.now()
• Reworks benchmarks/performance-observer-benchmark.js into phased benchmarks (initial set/get/has/delete, eviction stress, clear) with a consistent 10k-iteration default
• Adds timing coverage for additional cache APIs like keys(), values(), entries(), setWithEvicted(), and expiresAt()
• Adjusts the scalability test timing so cache construction is excluded from the measured set loop
• Updates README text for benchmark:perf to reflect generic performance measurements
• Updates npm test to run lint before mocha

Technical Notes: Benchmark output is consolidated via console.table with basic stats (avg/min/max/median/stddev) and an ops/sec estimate derived from average time.

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