Bode plot / group delay of enabled/configured filtering

[fujin]

It would be grand if in BFC, we were able to calculate the Bode plots for, and/or group delay for the entire filtering pipeline(s) (for want of better terminology), probably split up into controls (radio protocol, RC interpolation/smoothing), sensors (gyro DLPF, gyro lowpass/lowpass2, gyro notches, dynamic notch), flight (yaw lowpass, d-term lowpass/lowpass2)

References:
#1039 betaflight/betaflight#5229