JLine should look for `JansiTerminalProvider` in different classloaders

[jbonofre]

JLine should be improved about in which classloader is looking for the JansiTerminalProvider:

1. It should first look for the provider in the ThreadContextClassLoader.
2. Then, if the provider is not found in the TCCL, it should go in the TerminalProvider class loader.

I will propose a PR to improve this.

C.f.: apache/karaf@3be3809