Fix repl failing to start on python 3.8, address review comments

[dhoomakethu]

Accidentally deleted remote branch for #5
Reopening again

Closes #2

pymodbus on  dev [$?] via 🐍 v3.8.13 (pymodbus)
❯ pymodbus.server --host 0.0.0.0 --verbose run --modbus-config /Users/sanjay/repo/pymodbus/pymodbus/server/reactive/default_config.json --modbus-server tcp --modbus-framer socket --modbus-port 5020 --unit-id 1 --unit-id 2 -u 4 -r 1 --timeout 2
2024-02-17 13:14:56,530 INFO  logging:97 Modbus server started
2024-02-17 13:14:56,530 DEBUG logging:103 Awaiting connections server_listener
2024-02-17 13:14:56,531 INFO  logging:97 Server listening.

__________                          .______.                    _________
\______   \___.__. _____   ____   __| _/\_ |__  __ __  ______  /   _____/ ______________  __ ___________
 |     ___<   |  |/     \ /  _ \ / __ |  | __ \|  |  \/  ___/  \_____  \_/ __ \_  __ \  \/ // __ \_  __ \\
 |    |    \___  |  Y Y  (  <_> ) /_/ |  | \_\ \  |  /\___ \   /        \  ___/|  | \/\   /\  ___/|  | \/
 |____|    / ____|__|_|  /\____/\____ |  |___  /____//____  > /_______  /\___  >__|    \_/  \___  >__|
           \/          \/            \/      \/           \/          \/     \/                 \/


SERVER >

The issue was with typing module on python3.8 and use of from future import annotations.
Works also on the other versions of python

For conversation refer #5