isolate

• DISCONTINUE PACKAGE This package is no longer maintained by the Dart team.
• Make IsolateRunner.close not hang if called more than once.

• Migrate to null safety.
• Add singleResponseFutureWithTimeout and singleCallbackPortWithTimeout, while deprecating the timeout functionality of singleResponseFuture and singleCallbackPort.

• Update SDK requirements.
• Fix bug in IsolateRunner.kill with a zero duration.
• Update some type from Future to Future<void>.
• Make LoadBalancer.runMultiple properly generic.

• Use lower-case constants from dart:io.

• Make port functions generic so they can be used in a Dart 2 type-safe way.

• Add generic arguments to run in LoadBalancer and IsolateRunner.
• Add generic arguments to singleCallbackPort and singleCompletePort.

Update to version 1.0.0

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Review-Url: https://codereview.chromium.org//1654813002 .

• Change to using package:test for testing.

• Fixed strong mode analysis errors.
• Migrated tests to package:test.

• Made Isolate.kill parameter priority a named parameter.

• Renamed library isolaterunner.dart to isolate_runner.dart.
• Renamed library loadbalancer.dart' to load_balancer.dart`.

• Initial version
• Adds IsolateRunner as a helper around Isolate.
• Adds single-message port helpers and a load balancer.