[Platform] Consider adding CATs to MTRDeviceControllerStartupParams

[bzbarsky-apple]

Reproduction steps

The only way to create an opcert with CATs for a device controller on Darwin right now is to provide all the certs, so you can provide the opcert. If the cert is internally generated and signed with a provided signing key, there is no way to indicate it should have specific CATs.

We should consider adding something to MTRDeviceControllerStartupParams to allow passing in CATs.

Platform

darwin

Platform Version(s)

No response

Type

Manually tested with SDK

(Optional) If manually tested please explain why this is only manually tested

No response

Anything else?

No response