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Modbus FIFO Queue Service Module

This module provides the necessary structures and logic to handle Modbus operations related to FIFO Queues (Function Code 0x18).

It includes functionality for:

• Reading the contents of a remote FIFO queue of registers.
• Parsing response PDUs containing the FIFO count and register values.
• Validating data integrity (byte counts vs register counts).

This module is designed for no_std environments using heapless collections. The maximum number of registers in a single FIFO response is limited to 31 by the protocol.