MQTTBroker: Add status badge and toggle to broker page

[knolleary]

The agent runs by default, but can be optionally paused by the user.

This task is to reflect that in the UI.

This only applies to the 3rd party brokers today - until we move Team Broker over to use the agent as well.

PR #5081 adds an endpoint to get the current status of the broker.

This task will require:

Tasks

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1. Add api to start/stop agent.
2. UI: add status pill to broker page
3. UI: add start/stop toggle to broker page

[hardillb]

The agent already has a start/stop api

• POST /api/v1/commands/start
• POST /apt/v1/command/stop

These will toggle the client on/off in the agent

There is a app.containers.sendBrokerAgentCommand(broker, command) api where command is string with values

• start
• stop

[hardillb]

First 2 tasks done.

Start/stop UI still to do