Replace instrument settings

[alecandido]

The .settings field of the Instrument abstract class is inherited by all instruments,

qibolab/src/qibolab/_core/instruments/abstract.py

Line 32 in f74c334

settings: Optional[InstrumentSettings] = None

but it is now inconsistent with our favored scheme of storing all configurations (including bounds) in the components' configs database.

Possibly for this reason, this attribute is disregarded by many instruments (starting with the dummy itself).

We should convert the few remaining instances making use of it (mostly LOs, or only those.) to the configs' layout.