CAMEL-19350: outputTarget in camel-jpa (3.x)

[jcszymansk]

Description

Unlike camel-sql, camel-jpa does not allow the user to put the result elsewhere than the message body; if this is needed the user must: preserve the body, use the component, put the result in the desired destination, restore the body.

This PR adds the possibility to put the result into a header or property without destroying the message body.

Target

• I checked that the commit is targeting the correct branch (note that Camel 3 uses camel-3.x, whereas Camel 4 uses the main branch)

Tracking

• If this is a large change, bug fix, or code improvement, I checked there is a JIRA issue filed for the change (usually before you start working on it).

Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I formatted the code using mvn -Pformat,fastinstall install && mvn -Psourcecheck

[github-actions]

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[davsclaus]

Can you use something else than a dot to store as property vs header, this is frankly a bit confusing.
Instead use a prefix such as property:, eg property:xxx

[jcszymansk]

OK, updated.

[davsclaus]

@jacekszymanski can you work on a PR for main branch so we will have this in Camel v4 as well.

[jcszymansk]

Sure, I will, I should have it later today.