Move InstrumentServer to instruments/transport

InstrumentServer is a general-purpose SCPI-over-TCP server that can
host any device implementing the SCPIDevice protocol (process method).
Moving it from simulation/ to instruments/transport/ reflects this:
- simulation package now depends on instruments package
- InstrumentServer can host both virtual and real instrument adapters
- Added SCPIDevice Protocol for type-safe device registration

src/py_dvt_ate/simulation/server.py

@@ -11,8 +11,8 @@ import logging
 import signal
 from dataclasses import dataclass
 
+from py_dvt_ate.instruments.transport import InstrumentServer
 from py_dvt_ate.simulation.physics.engine import PhysicsEngine
-from py_dvt_ate.simulation.tcp_server import InstrumentServer
 from py_dvt_ate.simulation.virtual.chamber import ThermalChamberSim
 from py_dvt_ate.simulation.virtual.multimeter import MultimeterSim
 from py_dvt_ate.simulation.virtual.power_supply import PowerSupplySim