Inspect Camel route to auto-detect onException classes for native build

[apupier]

Describe the feature here

when using onException(MyExeption.class) in native mode, it would be nice to auto-detect that this class is needed for reflection.

[JiriOndrusek]

The required change in code requires https://github.com/apache/camel-quarkus/issues/97.

There were attempts to get model during the build time (like https://github.com/apache/camel-quarkus/pull/178), unfortunately we do not have an easy way of achieving this currently.