(chores) camel-file: code cleanup

[orpiske]

• break large and complex methods

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[davsclaus]

have you tested camel-ftp, and camel-jsch that extends camel-file

[orpiske]

have you tested camel-ftp, and camel-jsch that extends camel-file

Yes. All of these changes go through multiple full builds on my own CI (i.e.: this change was done 2 days ago and have been under test a couple of times - last CI build, the 5th, is still in progress though)

[orpiske]

Looking fine on my own CI. Let's merge and see how it goes on ASF one.