Split the JUnit 5 `OutputCapture` class into separate `OutputExtension` and `CapturedOutput` classes. The JUnit 5 callback methods are now contained only in the `OutputExtension` class so no longer pollute the public API that users will interact with. The `CapturedOutput` class has also been updated to capture System.err and System.out separately to allow distinct assertions if required. Closes gh-17029
= Spring Boot Sample Data Cassandra
To run the project, need to run below `cql` commands on Cassandra.
== Keyspace Creation in Cassandra
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CREATE KEYSPACE mykeyspace WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
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== Table Creation in Cassandra
Run `cql` using the link:src/test/resources/setup.cql[setup script] located in resources folder.