Improved benchmarking

[tolauwae]

• Use ReBench for benchmarking #88
• Create more specific and useful benchmarks for WARDuino:
  • Message parsing benchmarks: performance of parsers on the vm? (relevance: mqtt messages, webscraping, json parser, influxdb message parsing, ...)
  • SPI throughput benchmarks: how fast can we send data to SPI interfaces?
  • Benchmarks for event system on idle system
• Integrate benchmarks with CI #258
• Use a self-hosted runner: Raspberry PI connected to an actual ESP32 to run benchmarks on