Enhanced memory benchmarking task for Raxol terminal emulator.

Phase 2 Implementation: Terminal-specific memory scenarios with meaningful allocations.

Usage: mix raxol.bench.memory # Run all memory benchmarks mix raxol.bench.memory terminal # Run terminal component benchmarks mix raxol.bench.memory buffer # Run buffer operation benchmarks mix raxol.bench.memory simulation # Run realistic usage simulations mix raxol.bench.memory --profile # Include memory profiling integration mix raxol.bench.memory --quick # Quick memory benchmark run