2.3.0

• #106 Introduced new MetricsTestKit module that allows asserting certain metrics have been emitted etc.
  • we will provide more documentation soon; meanwhile you can use this test as reference for how to use the testkit here's how one uses it for those curious https://github.com/apple/swift-cluster-membership/blob/main/Tests/SWIMTests/SWIMMetricsTests.swift