sys-id: implement linear and log sine sweeps

[bresch]

Ref: https://www.recordingblogs.com/wiki/sine-sweep

To be used in

• Signal generator #22666 (auto-tune Fixed-wing)
• MC autotune: change signal input to sine sweep #21857 (auto-tune MC)

Linear sweep:

Log sweep:

[dagar]

There's also the chirp used in fake_imu (for filter testing).

PX4-Autopilot/src/examples/fake_imu/FakeImu.cpp

Lines 103 to 104 in cb396a6

	// linear-frequency chirp, see https://en.wikipedia.org/wiki/Chirp
	const double x_F = x_f0 + (x_f1 - x_f0) * t / (2 * T);