Rename component category `Relay` to `Contactor` or `CircuitBreaker`

[tiyash-basu-frequenz]

What's needed?

We got a request to look into alternative names for component category Relay. The suggested alternatives were Contactor and CircuitBreaker

Proposed solution

No response

Use cases

No response

Alternatives and workarounds

No response

Additional context

No response

[hannah-stevenson-frequenz]

Maybe even switch is more generic. How the switch works is not important. Not committing to relay needing changing, just giving options.