OnlyIf condition functionality - update to allow building condition separately as part of a callback

[mike12345567]

An idea from Andrew Kingston was to use a callback for onlyIf() calls, like onlyIf(operation => operation.property().equals()) as this provides a few key benefits, the ability to reuse condition functions, its less opinionated in terms of where the onlyIf should be placed in the call and it is easier to read in terms of indentation after linters have been applied.