Add an access abstraction (only array tests work, yet)

The access abstraction will be the new way of accessing builtin objects. This way it will be easier to move that to another process

jedi/api/__init__.py

@@ -16,7 +16,7 @@ import parso
 from parso.python import tree
 from parso import python_bytes_to_unicode, split_lines
 
-from jedi.parser_utils import get_executable_nodes, get_statement_of_position
+from jedi.parser_utils import get_executable_nodes
 from jedi import debug
 from jedi import settings
 from jedi import cache