Provide set of meaningful benchmarks

[playpauseandstop]

To ensure that performance is not touched between rororo releases.

As of now I'm thinking about using pyperf as benchmark runner, and benchmarking,

• In todobackend example,
  • setup_openapi performance
  • validate_request performance by creating 100+ todos via create_todo operation (without Redis layer)
  • validate_response performance by emulating list_todos operation with 100+ todos (without Redis layer)
• In hobotnica example,
  • validate_security performance for basic auth
  • validate_security performance for HTTP auth

To complete task need to store benchmark results somewhere (gh-pages branch or as release artifact) and have ability to compare benchmark results between releases.