Enable `control_model` feature

[mattlevine22]

@cooijmanstim + R-ADA team is interested in this feature (i.e., a model that computes controls via u_k = g(x_filtered_k))

• Would need to appear inside the filtering scans, so is "easy"/"hard" depending on the filtering module.
• e.g., Cuthbert would be "easier" because we manage their filter/predict scans in dynestyx.
• CD-Dynamax/Dynamax would be "harder" because we have them do closed-loop filter/predict scans (and don't support control models).
  • They could be modified to support this
  • Alternatively, we could try to use their lower-level APIs (probably doable).