Replace FunctionRunner with Runner in CLI

Author: fernandezcuesta

function/main.py

@@ -10,7 +10,7 @@
 @sdkcli.standard_options
 def cli(**kwargs):
     """A Crossplane composition function."""
-    sdkcli.run(fn.FunctionRunner(), **kwargs)
+    sdkcli.run(fn.Runner(), **kwargs)
 
 
 if __name__ == "__main__":