Add baking in QM driver

[stavros11]

Essentially support playing and sweeping over durations with 1ns resolution (lifting the 4ns constraint). Also the related discussion in #979 should now be fixed. Here I am doing the "baking" (=padding with zeros) myself, instead of using the QM helpers, because this way it fits better with the rest of the driver.

Here is an example of the Rabi length with 1ns step: http://login.qrccluster.com:9000/EWxzJbXUSwmaT8_ES4pF0g==

This is ready for the most part. I just need to check how it behaves for rectangular pulses, but I need to write a script to do this.

[codecov]

Codecov Report

Attention: Patch coverage is 11.76471% with 30 lines in your changes missing coverage. Please review.

Project coverage is 42.80%. Comparing base (e7a8d18) to head (60580ce).
Report is 10 commits behind head on 0.2.

Files	Patch %	Lines
src/qibolab/instruments/qm/program/instructions.py	7.14%	13 Missing ⚠️
src/qibolab/instruments/qm/program/sweepers.py	14.28%	6 Missing ⚠️
src/qibolab/instruments/qm/config/pulses.py	16.66%	5 Missing ⚠️
src/qibolab/instruments/qm/config/config.py	0.00%	4 Missing ⚠️
src/qibolab/instruments/qm/controller.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              0.2    #1005      +/-   ##
==========================================
- Coverage   42.88%   42.80%   -0.09%     
==========================================
  Files          80       80              
  Lines        5624     5642      +18     
==========================================
+ Hits         2412     2415       +3     
- Misses       3212     3227      +15     

Flag	Coverage Δ
unittests	42.80% <11.76%> (-0.09%)	⬇️

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[stavros11]

This is now fully implemented (excluding #1007 which I am not planning to do for 0.2) and tested on a few different occasions including rectangular pulses.

[stavros11]

@alecandido thanks for approving. Shall I merge this? There may be conflicts with #1001 but hopefully not much.

[alecandido]

@alecandido thanks for approving. Shall I merge this? There may be conflicts with #1001 but hopefully not much.

I will take care of rebasing. Please, go ahead :)