[componentstatus] Consider moving `Watcher` interface and `InstanceID` struct to a package in `extension`

              I would move this + the `InstanceId` to the "extension/statuswatcher` or something like that to be consistent with storage and other type of extensions.

_Originally posted by @bogdandrutu in https://github.com/open-telemetry/opentelemetry-collector/pull/10730#discussion_r1697390399_
            