CAMEL-20833 Add a recursive option for polling files and subdirectories

[cunningt]

Description

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[orpiske]

Thanks for looking at this, @cunningt ! LGTM.

Just fix the item pointed by Claus and it should be good to merge.

[davsclaus]

@cunningt did you get a chance to update this PR

[cunningt]

Sorry about that! Removed the default value for the path, added a null check on path.