Add QCoDeS instrument drivers

[david-eun]

This PR addresses the addition of QCoDeS instrument drivers for the following devices:

• APSYN420
• SynthHD
• SynthUSB2
• SynthNV
• E3631A
• DS1052E
• MSO7054
• DAC8734 (Added 2025.08.05)

In addition, instrument class SerialPortInstrument, a subclass of Instrument, has been added for devices that communicate via the serial port.

Testing

• The drivers are to be tested yet.

[david-eun]

Testing and Changes (2025.07.30)

• KDC101: It seems to work as expected after fixing a bug. Its serial number can be found in Kinesis Software.
  (Note: When executing the go_home function, the position parameter does not update to 0 as it says on the device. There might be more issues similar to this in which the parameters go out of sync. Since they refresh when the instrument is recreated, I assume it's a bug within the DLL, but I could have just simply misunderstood something... In addition, the is_moving function does not seem to work as expected.)
• SG386: Works well!
• Keithley2230G-30-6: The generic Keithley2230G driver worked well when testing last winter. Added a child driver class Keithley2230G_30_6 that specifies voltage and current limits, in parallel with the previous addition of the new class Keithley2230G_60_3. (I need a USB cable for further testing, but I can't seem to find it :(

[david-eun]

Testing and Changes (2025.07.31)

• SynthHD: Worked well as expected after a few bug fixes
• Keithley2230G-30-6 Update: Also works well