Add support for communicating with app assigned devices

[Steve-Mcl]

Description

Adds support for communicating with app assigned devices Updates node editor labels Update docs to mention devices

Related Issue(s)

https://github.com/FlowFuse/flowfuse/issues/3018

Checklist

• [x] I have read the contribution guidelines
• [ ] Suitable unit/system level tests have been added and they pass
• [x] Documentation has been updated
  • [ ] Upgrade instructions
  • [ ] Configuration details
  • [ ] Concepts
• [ ] Changes flowforge.yml?
  • [ ] Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • [ ] Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• [ ] Backport needed? -> add the backport label
• [ ] Includes a DB migration? -> add the area:migration label

[Steve-Mcl]

@knolleary I have updated this to use app:app-id in the topics.

NOTE: I acknowledge no tests are written for this PR. I will follow up with an issue to get the first round of tests implemented that cover these changes.

[Steve-Mcl]

@knolleary changes pushed for using dev: topic prefix