Reject MQTT topics which include control- or non-characters

[emontnemery]

Proposed change

Reject MQTT topics which include control- or non-characters

Background:
The MQTT specification specifies that topics "SHOULD NOT" include control- or non-characters and that a server or client MAY close the connection if such characters are present.
Mosquitto does just that, without any warning message or error: eclipse-mosquitto/mosquitto@94fdc9c

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes MQTT terminates the connection if many devices are to be detected via autodiscovery. #71088
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
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• Tests have been added to verify that the new code works.

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[emontnemery]

@Koenkk This needs to be enforced in zigbee2mqtt too

[jbouwh]

Looks good to me

[balloob]

Verified tests pass locally.