Add get_firmware_version

[bessman]

Summary by Sourcery

Add functionality to retrieve the firmware version in the serial handler by introducing a new method get_firmware_version and a corresponding command GET_FW_VERSION in the protocol.

New Features:

• Introduce a method get_firmware_version in the serial_handler.py to retrieve the firmware version as a tuple of major, minor, and patch numbers.

Enhancements:

• Add a new command GET_FW_VERSION in protocol.py to support the firmware version retrieval functionality.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request adds functionality to retrieve the firmware version of the PSLab device. It introduces a new method get_firmware_version() in the Handler class and updates the initialization process to store the firmware version. The changes also include adding a new command code for getting the firmware version in the protocol file.

File-Level Changes

Files	Changes
pslab/serial_handler.py	Added a new method get_firmware_version() to retrieve the firmware version as a tuple of integers (major, minor, patch)
pslab/serial_handler.py	Updated the __init__ method to store the firmware version upon initialization
pslab/serial_handler.py	Added error handling for devices with firmware versions older than 3.0.0
pslab/protocol.py	Added a new command code GET_FW_VERSION in the protocol file
pslab/serial_handler.py	Added from __future__ import annotations for forward reference support

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