Function validateMqttUtf8

validateMqttUtf8(bytes: Uint8Array): DecodeResult<string>
Validates UTF-8 bytes for MQTT compliance.

Checks that the bytes:
1. Are valid UTF-8
2. Don't contain MQTT-prohibited characters
Parameters
- bytes: Uint8Array
  The UTF-8 bytes to validate
Returns DecodeResult<string>
DecodeResult with the decoded string or error

See
MQTT 5.0 §1.5.4
- Defined in codec/utf8.ts:100