camel-core - File producer should by default not allow writing files to directories outside its starting directory

For example

<from uri="file:src/test/resources/data?noop=true"/>
<setHeader headerName="CamelFileName">
    <simple>../../${file:name}</simple>
</setHeader>
<to uri="file:target/results"/>

Can write the file outside the target/results folder. We should not allow this by default to be more security friendly.

We should add a new option (maybe name it jailStartingDirectory or allowWriteOutsideStartingDirectory) or some better name