Control port used to send control messages to the isolate.
The control port identifies the isolate.
An Isolate object allows sending control messages through the control port.
Some control messages require a specific capability to be passed along with the message (see pauseCapability and terminateCapability), otherwise the message is ignored by the isolate.
final SendPort controlPort
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https://api.dart.dev/stable/2.5.0/dart-isolate/Isolate/controlPort.html