Backport CLI test suite to influxdb from influxdb_pro

[mgattozzi]

https://github.com/influxdata/influxdb_pro/pull/193 added the ability to test our CLI and reorganized files in influxdb3/tests in order to do so such as making influxdb3/tests/server/main.rs a mod.rs file with a top level influxdb3/tests/lib.rs file so that we could share code between different integration tests such as TestServer. We should backport these changes to influxdb so that we can actually test our CLI works the way we expect it to outside of just integration tests for the server itself.