chore: update zigbee example to use thin-edge.io MQTT topic structure to v1

[reubenmiller]

Proposed changes

Update zigbee example to use the thin-edge.io v1 MQTT topics, e.g. tedge/measurements => te/device/main///m/.

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New example (non-breaking change which adds functionality)
• [x] Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• [ ] Documentation Update (if none of the other choices apply)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have signed the CLA (in all commits with git commit -s)
• [ ] I have added necessary documentation (if appropriate)

Further comments