Implement Infinite Data Logging/Replay

[synthfi]

• Regular data logging & replay rely on having buffers loaded in memory for fast operation
• for simulations that don't need to be fast, or will execute for very long periods of time, need another way
• logging
  • create a Julia interface that creates a small buffer that can be written to file or sent to a database every N time steps. The rust app writes into the internal buffer, with a callback to note buffer is full. Can be done serially or with two buffers for speed.
• replay
  • similar fashion, use callback to note that new data must be loaded.