ModuleFactory missing from the scanFor<>Files() methods

[jayasuryat]

ModuleFactory is missing from the scanFor<>Files() methods. It is currently only being used in the Module factory extension.

The intension was always to expose this in the scanFor<>Files() methods and have DefaultModuleFactory as a default value. Somehow I missed this in the earlier releases.

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TODO

• Take ModuleFactory as a param for all of the scanFor<>Files() methods with DefaultModuleFactory as the default value
• Update tests to test if all the scanFor<>Files() methods are properly using the passed ModuleFactory
• Dump and validate public API

This would be a backwards-source-compatible change as we are just adding a new param with default value, so all of the existing call-sites should work as is.