Issue #14605: Expose importlib.abc.FileLoader and
importlib.machinery.(FileFinder, SourceFileLoader,
_SourcelessFileLoader, ExtensionFileLoader).

This exposes all of importlib's mechanisms that will become public on
the sys module.
diff --git a/Misc/NEWS b/Misc/NEWS
index 975e684..5bb9b92 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -61,6 +61,9 @@
 Library
 -------
 
+- Issue #14605: Add importlib.abc.FileLoader, importlib.machinery.(FileFinder,
+  SourceFileLoader, _SourcelessFileLoader, ExtensionFileLoader).
+
 - Issue #13959: imp.cache_from_source()/source_from_cache() now follow
   os.path.join()/split() semantics for path manipulation instead of its prior,
   custom semantics of caring the right-most path separator forward in path