SendableContext complies with the Sendable protocol and inherits from lang.ISendable.
SendableContext, which complies with the Sendable protocol, can be converted to a Context object to implement data transmission between concurrent ArkTS instances (including the main thread and the worker thread of TaskPool or Worker).
System capability: SystemCapability.Ability.AbilityRuntime.Core
Atomic service API: This API can be used in atomic services since API version 12.