isolate_manager library Null safety

Classes

IsolateManager
Abstract class for IsolateManagerImpl which implement work with real Isolate, MockIsolateManager which doesn't create a real Isolate and web implementation

Typedefs

IsolateRun = void Function(IsolateMessenger messager, IsolateInitializer initializer, IsolateInitializeArguments args)
Signature for function which will run in isolate