Create performance benchmark for porla container

[freol35241]

This commit introduces a complete benchmarking framework for porla to measure and document performance characteristics across various scenarios.

New benchmarking infrastructure:

• Automated test orchestration with benchmark.sh
• Data generation tool for different line lengths
• Throughput and latency measurement utilities
• ASCII chart generation using plotille library

Benchmark scenarios:

1. Baseline throughput (raw bus capacity)
2. Processing pipelines (timestamp, jsonify, b64)
3. Multi-stage bus transfers (2-3 hops)
4. Fan-out performance (multiple readers)
5. Fan-in performance (multiple writers)

Key features:

• Tests various line lengths (50B to 4KB)
• Measures lines/s and bytes/s throughput
• Generates ASCII charts for visualization
• Includes example results and documentation
• Configurable test duration and scenarios
• Quick mode for faster testing

Documentation updates:

• Added comprehensive Performance section to README.md
• Included ASCII charts showing throughput characteristics
• Provided use case guidelines based on performance data
• Created detailed benchmarking/README.md with instructions

The benchmarking suite helps users:

• Understand porla's performance characteristics
• Choose appropriate configurations for their use cases
• Benchmark their specific hardware environment
• Optimize pipeline designs for throughput requirements

Example results show typical performance:

• 70k+ lines/s for baseline (200-byte lines)
• 60k+ lines/s with timestamp processing
• 40k+ lines/s with jsonify processing
• Efficient multicast fan-out to 8+ readers