Add periodic connection refresh

[javiercr]

Context

We've observed some scenarios where users stop getting messages. Reconnecting them seems to solve the issue.

Description

This PR adds a new force_refresh_interval_seconds config option to force the connection to be refreshed. Default is 0 (disables force refresh). This is the equivalent to mautrix/meta#58.

How to test this

Clone the branch, change force_refresh_interval_seconds to a small interval (eg: 10 seconds), run the bridge locally and you should see:

[2024-05-23 17:08:38,712] [INFO@mau.user.@REDACTED] Scheduling forced reconnect in 20 seconds. Connection will be refreshed at 2024-05-23 17:08:58

[2024-05-23 17:08:58,714] [INFO@mau.user.@REDACTED] Reconnecting to Telegram...
[2024-05-23 17:08:58,716] [INFO@telethon.611285941.network.mtprotosender] Disconnecting from 149.154.167.91:443/TcpFull...
[2024-05-23 17:08:58,720] [INFO@telethon.611285941.network.mtprotosender] Disconnection from 149.154.167.91:443/TcpFull complete!
[2024-05-23 17:08:58,722] [INFO@telethon.611285941.client.updates] Update loop finished
[2024-05-23 17:08:58,740] [INFO@telethon.611285941.client.telegrambaseclient] Saving update states
[2024-05-23 17:08:58,741] [DEBUG@mau.user.@REDACTED] Initializing client for @REDACTED
[2024-05-23 17:08:58,742] [INFO@mau.user.@REDACTED] Scheduling forced reconnect in 20 seconds. Connection will be refreshed at 2024-05-23 17:09:18
[2024-05-23 17:08:58,742] [INFO@telethon.611285941.network.mtprotosender] Connecting to 149.154.167.91:443/TcpFull...
[2024-05-23 17:08:58,775] [INFO@telethon.611285941.network.mtprotosender] Connection to 149.154.167.91:443/TcpFull complete!

[2024-05-23 17:09:18,743] [INFO@mau.user.@REDACTED] Reconnecting to Telegram...
[2024-05-23 17:09:18,743] [INFO@telethon.611285941.network.mtprotosender] Disconnecting from 149.154.167.91:443/TcpFull...
[2024-05-23 17:09:18,744] [INFO@telethon.611285941.network.mtprotosender] Disconnection from 149.154.167.91:443/TcpFull complete!
[2024-05-23 17:09:18,744] [INFO@telethon.611285941.client.updates] Update loop finished
[2024-05-23 17:09:18,745] [INFO@telethon.611285941.client.telegrambaseclient] Saving update states
[2024-05-23 17:09:18,746] [DEBUG@mau.user.@REDACTED] Initializing client for @REDACTED
[2024-05-23 17:09:18,746] [INFO@mau.user.@REDACTED] Scheduling forced reconnect in 20 seconds. Connection will be refreshed at 2024-05-23 17:09:38

Make sure you're still able to send and receive messages.

[tulir]

Looks sensible