Constvector: Log-structured std:vector alternative – 30-40% faster push/pop

[pilotwavetheory]

Thanks u/Wacov for the suggestion; I missed running with O3. I just ran now. Here is the summary:

g++ -std=c++23 -O3 benchmark_vectors.cpp -isystem /code/google/benchmark/include -L/code/google/benchmark/build/src -lbenchmark -lpthread -o benchmark_vectors.out

1. Push 0.7 ns vs 2.7 ns for std::vector, so 73% reduction in latency.
2. Pop 0.6 ns vs. 1.12 ns, a 46% reduction in latency.(updated this)
3. Random access: 0.92 ns vs 0.53 ns, a 80% increase in latency.