Feat/doc and test traced

[loicmathieu]

Add @Traced to the documentation. It exists in the quickstart so it's worth mentioning it inside the guide.

Update the main integration test to use @Traced in another bean as the REST endpoint is traced by default and it reflect the typical usage of @Traced.

[gastaldi]

LGTM, but it would be nice to squash before merging these commits 👍

[loicmathieu]

@gastaldi I applied your suggestions

[loicmathieu]

@gastaldi I keep two commits as they are unrelated changes: documentation and test enhancement

[gastaldi]

@loicmathieu cool, maybe the commit with my suggestion can be squashed into the first commit then 😉

[loicmathieu]

@loicmathieu cool, maybe the commit with my suggestion can be squashed into the first commit then 😉

Already done, I always squashed suggestion commits a few seconds/minutes after commiting them, you was too hurry ;)

[gastaldi]

Thanks!