File filter - provide file sync, with filename and content rewriting

[ashleyfrieze]

// optional @Rule on subclass that is a rule
// with JUnit5 extension to execute it
public FileSource fileSource = new FileSource(fromPath("../other-project/src/test/resources"))
    .renamed(stripExtension())
    .copyTo(Paths.get("src/test/resources/copied"))
    .filterLines(replace("```", "\"\"\"");

with .execute method to just do it now
with .clean method to wipe them
with .syncMode() allowing ADD_ONLY, INCREMENTAL or CLEAN, or MIRROR