Sequences with different frequencies are not separated

[jevillegasdatTII]

https://github.com/qiboteam/qibolab/blob/898fa86c2ed60f3a0cd149715c73db508f924f9b/src/qibolab/pulses.py#L1586

When sending two pulse sequences over the same channel, provided they don't overlap in time, they are not getting separated into different sequencers. Consequently, the frequency of the first pulse defines the nco frequency for the sequence and all the following pulses use the same frequency irrespective of their settings. For instance, the following code generates the attached sequences sent to qblox.

sequence = PulseSequence()
rx_pulse_q0 = platform.create_RX_pulse(0, start = 0)
rx_pulse_q1 = platform.create_RX_pulse(1, start = 0)
sequence.add(rx_pulse_q0)
sequence.add(rx_pulse_q1)
cr_pulse = platform.create_RX_pulse(1, start = rx_pulse_q1.finish)
cr_pulse.frequency = rx_pulse_q0.frequency
cr_pulse.duration = 1000
sequence.add(cr_pulse)

Z_qcm_rf0_sequencer1_sequence.json Z_qcm_rf0_sequencer0_sequence.json Z_qcm_rf0_snapshot.json

Notably, only two sequencers are created, where we need three (channel 2 with two different frequencies and channel one a single one).